diff --git a/.eslintrc.js b/.eslintrc.js
index 56e3d0530f..177496d3a3 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -41,6 +41,11 @@ module.exports = {
       'node_modules',
       '\\.(css|scss|json)$',
     ],
+    'import/resolver': {
+      node: {
+        paths: ['app/javascript'],
+      },
+    },
   },
 
   rules: {
diff --git a/app/javascript/mastodon/components/attachment_list.js b/app/javascript/mastodon/components/attachment_list.js
index 8e5bb0e0be..5dfa1464c4 100644
--- a/app/javascript/mastodon/components/attachment_list.js
+++ b/app/javascript/mastodon/components/attachment_list.js
@@ -2,6 +2,7 @@ import React from 'react';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import PropTypes from 'prop-types';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import Icon from 'mastodon/components/icon';
 
 const filename = url => url.split('/').pop().split('#')[0].split('?')[0];
 
@@ -24,7 +25,7 @@ export default class AttachmentList extends ImmutablePureComponent {
 
               return (
                 <li key={attachment.get('id')}>
-                  <a href={displayUrl} target='_blank' rel='noopener'><i className='fa fa-link' /> {filename(displayUrl)}</a>
+                  <a href={displayUrl} target='_blank' rel='noopener'><Icon id='link' /> {filename(displayUrl)}</a>
                 </li>
               );
             })}
@@ -36,7 +37,7 @@ export default class AttachmentList extends ImmutablePureComponent {
     return (
       <div className='attachment-list'>
         <div className='attachment-list__icon'>
-          <i className='fa fa-link' />
+          <Icon id='link' />
         </div>
 
         <ul className='attachment-list__list'>
diff --git a/app/javascript/mastodon/components/column_back_button.js b/app/javascript/mastodon/components/column_back_button.js
index 8a60c4192a..f41045787e 100644
--- a/app/javascript/mastodon/components/column_back_button.js
+++ b/app/javascript/mastodon/components/column_back_button.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
 import PropTypes from 'prop-types';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnBackButton extends React.PureComponent {
 
@@ -19,7 +20,7 @@ export default class ColumnBackButton extends React.PureComponent {
   render () {
     return (
       <button onClick={this.handleClick} className='column-back-button'>
-        <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+        <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
         <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
       </button>
     );
diff --git a/app/javascript/mastodon/components/column_back_button_slim.js b/app/javascript/mastodon/components/column_back_button_slim.js
index 964c100bef..cc8bfb1515 100644
--- a/app/javascript/mastodon/components/column_back_button_slim.js
+++ b/app/javascript/mastodon/components/column_back_button_slim.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
 import ColumnBackButton from './column_back_button';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnBackButtonSlim extends ColumnBackButton {
 
@@ -8,7 +9,7 @@ export default class ColumnBackButtonSlim extends ColumnBackButton {
     return (
       <div className='column-back-button--slim'>
         <div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button column-back-button--slim-button'>
-          <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+          <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </div>
       </div>
diff --git a/app/javascript/mastodon/components/column_header.js b/app/javascript/mastodon/components/column_header.js
index f68e4155eb..f33c689e7c 100644
--- a/app/javascript/mastodon/components/column_header.js
+++ b/app/javascript/mastodon/components/column_header.js
@@ -2,6 +2,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import { FormattedMessage, injectIntl, defineMessages } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   show: { id: 'column_header.show_settings', defaultMessage: 'Show settings' },
@@ -109,22 +110,22 @@ class ColumnHeader extends React.PureComponent {
     }
 
     if (multiColumn && pinned) {
-      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><i className='fa fa fa-times' /> <FormattedMessage id='column_header.unpin' defaultMessage='Unpin' /></button>;
+      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><Icon id='times' /> <FormattedMessage id='column_header.unpin' defaultMessage='Unpin' /></button>;
 
       moveButtons = (
         <div key='move-buttons' className='column-header__setting-arrows'>
-          <button title={formatMessage(messages.moveLeft)} aria-label={formatMessage(messages.moveLeft)} className='text-btn column-header__setting-btn' onClick={this.handleMoveLeft}><i className='fa fa-chevron-left' /></button>
-          <button title={formatMessage(messages.moveRight)} aria-label={formatMessage(messages.moveRight)} className='text-btn column-header__setting-btn' onClick={this.handleMoveRight}><i className='fa fa-chevron-right' /></button>
+          <button title={formatMessage(messages.moveLeft)} aria-label={formatMessage(messages.moveLeft)} className='text-btn column-header__setting-btn' onClick={this.handleMoveLeft}><Icon id='chevron-left' /></button>
+          <button title={formatMessage(messages.moveRight)} aria-label={formatMessage(messages.moveRight)} className='text-btn column-header__setting-btn' onClick={this.handleMoveRight}><Icon id='chevron-right' /></button>
         </div>
       );
     } else if (multiColumn) {
-      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><i className='fa fa fa-plus' /> <FormattedMessage id='column_header.pin' defaultMessage='Pin' /></button>;
+      pinButton = <button key='pin-button' className='text-btn column-header__setting-btn' onClick={this.handlePin}><Icon id='plus' /> <FormattedMessage id='column_header.pin' defaultMessage='Pin' /></button>;
     }
 
     if (!pinned && (multiColumn || showBackButton)) {
       backButton = (
         <button onClick={this.handleBackClick} className='column-header__back-button'>
-          <i className='fa fa-fw fa-chevron-left column-back-button__icon' />
+          <Icon id='chevron-left' className='column-back-button__icon' fixedWidth />
           <FormattedMessage id='column_back_button.label' defaultMessage='Back' />
         </button>
       );
@@ -140,7 +141,7 @@ class ColumnHeader extends React.PureComponent {
     }
 
     if (children || multiColumn) {
-      collapseButton = <button className={collapsibleButtonClassName} title={formatMessage(collapsed ? messages.show : messages.hide)} aria-label={formatMessage(collapsed ? messages.show : messages.hide)} aria-pressed={collapsed ? 'false' : 'true'} onClick={this.handleToggleClick}><i className='fa fa-sliders' /></button>;
+      collapseButton = <button className={collapsibleButtonClassName} title={formatMessage(collapsed ? messages.show : messages.hide)} aria-label={formatMessage(collapsed ? messages.show : messages.hide)} aria-pressed={collapsed ? 'false' : 'true'} onClick={this.handleToggleClick}><Icon id='sliders' /></button>;
     }
 
     const hasTitle = icon && title;
@@ -150,7 +151,7 @@ class ColumnHeader extends React.PureComponent {
         <h1 className={buttonClassName}>
           {hasTitle && (
             <button onClick={this.handleTitleClick}>
-              <i className={`fa fa-fw fa-${icon} column-header__icon`} />
+              <Icon id={icon} fixedWidth className='column-header__icon' />
               {title}
             </button>
           )}
diff --git a/app/javascript/mastodon/components/icon.js b/app/javascript/mastodon/components/icon.js
new file mode 100644
index 0000000000..d8a17722fe
--- /dev/null
+++ b/app/javascript/mastodon/components/icon.js
@@ -0,0 +1,21 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import classNames from 'classnames';
+
+export default class Icon extends React.PureComponent {
+
+  static propTypes = {
+    id: PropTypes.string.isRequired,
+    className: PropTypes.string,
+    fixedWidth: PropTypes.bool,
+  };
+
+  render () {
+    const { id, className, fixedWidth, ...other } = this.props;
+
+    return (
+      <i role='img' className={classNames('fa', `fa-${id}`, className, { 'fa-fw': fixedWidth })} {...other} />
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/components/icon_button.js b/app/javascript/mastodon/components/icon_button.js
index b96e48fd09..fbb42f78f8 100644
--- a/app/javascript/mastodon/components/icon_button.js
+++ b/app/javascript/mastodon/components/icon_button.js
@@ -3,6 +3,7 @@ import Motion from '../features/ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class IconButton extends React.PureComponent {
 
@@ -86,7 +87,7 @@ export default class IconButton extends React.PureComponent {
           style={style}
           tabIndex={tabIndex}
         >
-          <i className={`fa fa-fw fa-${icon}`} aria-hidden='true' />
+          <Icon id={icon} fixedWidth aria-hidden='true' />
         </button>
       );
     }
@@ -104,7 +105,7 @@ export default class IconButton extends React.PureComponent {
             style={style}
             tabIndex={tabIndex}
           >
-            <i style={{ transform: `rotate(${rotate}deg)` }} className={`fa fa-fw fa-${icon}`} aria-hidden='true' />
+            <Icon id={icon} style={{ transform: `rotate(${rotate}deg)` }} fixedWidth aria-hidden='true' />
           </button>
         )}
       </Motion>
diff --git a/app/javascript/mastodon/components/load_gap.js b/app/javascript/mastodon/components/load_gap.js
index ed4d445d0d..a44d55d093 100644
--- a/app/javascript/mastodon/components/load_gap.js
+++ b/app/javascript/mastodon/components/load_gap.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { injectIntl, defineMessages } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   load_more: { id: 'status.load_more', defaultMessage: 'Load more' },
@@ -25,7 +26,7 @@ class LoadGap extends React.PureComponent {
 
     return (
       <button className='load-more load-gap' disabled={disabled} onClick={this.handleClick} aria-label={intl.formatMessage(messages.load_more)}>
-        <i className='fa fa-ellipsis-h' />
+        <Icon id='ellipsis-h' />
       </button>
     );
   }
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index 20d8385009..2be6c4b36c 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -15,6 +15,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import { MediaGallery, Video } from '../features/ui/util/async-components';
 import { HotKeys } from 'react-hotkeys';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 // We use the component (and not the container) since we do not want
 // to use the progress bar to show download progress
@@ -204,7 +205,7 @@ class Status extends ImmutablePureComponent {
     if (featured) {
       prepend = (
         <div className='status__prepend'>
-          <div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-thumb-tack status__prepend-icon' /></div>
+          <div className='status__prepend-icon-wrapper'><Icon id='thumb-tack' className='status__prepend-icon' fixedWidth /></div>
           <FormattedMessage id='status.pinned' defaultMessage='Pinned toot' />
         </div>
       );
@@ -213,7 +214,7 @@ class Status extends ImmutablePureComponent {
 
       prepend = (
         <div className='status__prepend'>
-          <div className='status__prepend-icon-wrapper'><i className='fa fa-fw fa-retweet status__prepend-icon' /></div>
+          <div className='status__prepend-icon-wrapper'><Icon id='retweet' className='status__prepend-icon' fixedWidth /></div>
           <FormattedMessage id='status.reblogged_by' defaultMessage='{name} boosted' values={{ name: <a onClick={this.handleAccountClick} data-id={status.getIn(['account', 'id'])} href={status.getIn(['account', 'url'])} className='status__display-name muted'><bdi><strong dangerouslySetInnerHTML={display_name_html} /></bdi></a> }} />
         </div>
       );
diff --git a/app/javascript/mastodon/components/status_content.js b/app/javascript/mastodon/components/status_content.js
index 5e33656186..70713047d6 100644
--- a/app/javascript/mastodon/components/status_content.js
+++ b/app/javascript/mastodon/components/status_content.js
@@ -5,6 +5,7 @@ import { isRtl } from '../rtl';
 import { FormattedMessage } from 'react-intl';
 import Permalink from './permalink';
 import classnames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const MAX_HEIGHT = 642; // 20px * 32 (+ 2px padding at the top)
 
@@ -160,7 +161,7 @@ export default class StatusContent extends React.PureComponent {
 
     const readMoreButton = (
       <button className='status__content__read-more-button' onClick={this.props.onClick} key='read-more'>
-        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><i className='fa fa-fw fa-angle-right' />
+        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><Icon id='angle-right' fixedWidth />
       </button>
     );
 
diff --git a/app/javascript/mastodon/features/account/components/header.js b/app/javascript/mastodon/features/account/components/header.js
index 4f6d0712d1..7fe6d6a4f8 100644
--- a/app/javascript/mastodon/features/account/components/header.js
+++ b/app/javascript/mastodon/features/account/components/header.js
@@ -8,6 +8,7 @@ import spring from 'react-motion/lib/spring';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { autoPlayGif, me } from '../../../initial_state';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   unfollow: { id: 'account.unfollow', defaultMessage: 'Unfollow' },
@@ -149,7 +150,7 @@ class Header extends ImmutablePureComponent {
     }
 
     if (account.get('locked')) {
-      lockedIcon = <i className='fa fa-lock' title={intl.formatMessage(messages.account_locked)} />;
+      lockedIcon = <Icon id='lock' title={intl.formatMessage(messages.account_locked)} />;
     }
 
     const content         = { __html: account.get('note_emojified') };
@@ -176,7 +177,7 @@ class Header extends ImmutablePureComponent {
                   <dt dangerouslySetInnerHTML={{ __html: pair.get('name_emojified') }} title={pair.get('name')} />
 
                   <dd className={pair.get('verified_at') && 'verified'} title={pair.get('value_plain')}>
-                    {pair.get('verified_at') && <span title={intl.formatMessage(messages.linkVerifiedOn, { date: intl.formatDate(pair.get('verified_at'), dateFormatOptions) })}><i className='fa fa-check verified__mark' /></span>} <span dangerouslySetInnerHTML={{ __html: pair.get('value_emojified') }} />
+                    {pair.get('verified_at') && <span title={intl.formatMessage(messages.linkVerifiedOn, { date: intl.formatDate(pair.get('verified_at'), dateFormatOptions) })}><Icon id='check' className='verified__mark' /></span>} <span dangerouslySetInnerHTML={{ __html: pair.get('value_emojified') }} />
                   </dd>
                 </dl>
               ))}
diff --git a/app/javascript/mastodon/features/account_gallery/components/media_item.js b/app/javascript/mastodon/features/account_gallery/components/media_item.js
index 7c330c4303..80ac9d9ecb 100644
--- a/app/javascript/mastodon/features/account_gallery/components/media_item.js
+++ b/app/javascript/mastodon/features/account_gallery/components/media_item.js
@@ -3,6 +3,7 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Permalink from '../../../components/permalink';
 import { displayMedia } from '../../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 export default class MediaItem extends ImmutablePureComponent {
 
@@ -45,7 +46,7 @@ export default class MediaItem extends ImmutablePureComponent {
     } else {
       icon = (
         <span className='account-gallery__item__icons'>
-          <i className='fa fa-eye-slash' />
+          <Icon id='eye-slash' />
         </span>
       );
     }
diff --git a/app/javascript/mastodon/features/account_timeline/components/moved_note.js b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
index 280389bba9..3e090bb5f2 100644
--- a/app/javascript/mastodon/features/account_timeline/components/moved_note.js
+++ b/app/javascript/mastodon/features/account_timeline/components/moved_note.js
@@ -5,6 +5,7 @@ import { FormattedMessage } from 'react-intl';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import AvatarOverlay from '../../../components/avatar_overlay';
 import DisplayName from '../../../components/display_name';
+import Icon from 'mastodon/components/icon';
 
 export default class MovedNote extends ImmutablePureComponent {
 
@@ -33,7 +34,7 @@ export default class MovedNote extends ImmutablePureComponent {
     return (
       <div className='account__moved-note'>
         <div className='account__moved-note__message'>
-          <div className='account__moved-note__icon-wrapper'><i className='fa fa-fw fa-suitcase account__moved-note__icon' /></div>
+          <div className='account__moved-note__icon-wrapper'><Icon id='suitcase' className='account__moved-note__icon' fixedWidth /></div>
           <FormattedMessage id='account.moved_to' defaultMessage='{name} has moved to:' values={{ name: <bdi><strong dangerouslySetInnerHTML={displayNameHtml} /></bdi> }} />
         </div>
 
diff --git a/app/javascript/mastodon/features/compose/components/compose_form.js b/app/javascript/mastodon/features/compose/components/compose_form.js
index ac458fd259..9e7d391665 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.js
+++ b/app/javascript/mastodon/features/compose/components/compose_form.js
@@ -17,6 +17,7 @@ import { isMobile } from '../../../is_mobile';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { length } from 'stringz';
 import { countableText } from '../util/counter';
+import Icon from 'mastodon/components/icon';
 
 const allowedAroundShortCode = '><\u0085\u0020\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\u2028\u2029\u0009\u000a\u000b\u000c\u000d';
 
@@ -165,7 +166,7 @@ class ComposeForm extends ImmutablePureComponent {
     let publishText = '';
 
     if (this.props.privacy === 'private' || this.props.privacy === 'direct') {
-      publishText = <span className='compose-form__publish-private'><i className='fa fa-lock' /> {intl.formatMessage(messages.publish)}</span>;
+      publishText = <span className='compose-form__publish-private'><Icon id='lock' /> {intl.formatMessage(messages.publish)}</span>;
     } else {
       publishText = this.props.privacy !== 'unlisted' ? intl.formatMessage(messages.publishLoud, { publish: intl.formatMessage(messages.publish) }) : intl.formatMessage(messages.publish);
     }
diff --git a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
index e8f57a4661..3288f81f82 100644
--- a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
@@ -7,6 +7,7 @@ import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import detectPassiveEvents from 'detect-passive-events';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
@@ -132,7 +133,7 @@ class PrivacyDropdownMenu extends React.PureComponent {
             {items.map(item => (
               <div role='option' tabIndex='0' key={item.value} data-index={item.value} onKeyDown={this.handleKeyDown} onClick={this.handleClick} className={classNames('privacy-dropdown__option', { active: item.value === value })} aria-selected={item.value === value} ref={item.value === value ? this.setFocusRef : null}>
                 <div className='privacy-dropdown__option__icon'>
-                  <i className={`fa fa-fw fa-${item.icon}`} />
+                  <Icon id={item.icon} fixedWidth />
                 </div>
 
                 <div className='privacy-dropdown__option__content'>
diff --git a/app/javascript/mastodon/features/compose/components/search.js b/app/javascript/mastodon/features/compose/components/search.js
index d203d87800..1ab197ac58 100644
--- a/app/javascript/mastodon/features/compose/components/search.js
+++ b/app/javascript/mastodon/features/compose/components/search.js
@@ -5,6 +5,7 @@ import Overlay from 'react-overlays/lib/Overlay';
 import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import { searchEnabled } from '../../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   placeholder: { id: 'search.placeholder', defaultMessage: 'Search' },
@@ -116,8 +117,8 @@ class Search extends React.PureComponent {
         </label>
 
         <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
-          <i className={`fa fa-search ${hasValue ? '' : 'active'}`} />
-          <i aria-label={intl.formatMessage(messages.placeholder)} className={`fa fa-times-circle ${hasValue ? 'active' : ''}`} />
+          <Icon id='search' className={hasValue ? '' : 'active'} />
+          <Icon id='times-circle' className={hasValue ? 'active' : ''} aria-label={intl.formatMessage(messages.placeholder)} />
         </div>
 
         <Overlay show={expanded && !hasValue} placement='bottom' target={this}>
diff --git a/app/javascript/mastodon/features/compose/components/search_results.js b/app/javascript/mastodon/features/compose/components/search_results.js
index f0ddf6d714..e0966f52c4 100644
--- a/app/javascript/mastodon/features/compose/components/search_results.js
+++ b/app/javascript/mastodon/features/compose/components/search_results.js
@@ -6,6 +6,7 @@ import AccountContainer from '../../../containers/account_container';
 import StatusContainer from '../../../containers/status_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import Hashtag from '../../../components/hashtag';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   dismissSuggestion: { id: 'suggestions.dismiss', defaultMessage: 'Dismiss suggestion' },
@@ -34,7 +35,7 @@ class SearchResults extends ImmutablePureComponent {
         <div className='search-results'>
           <div className='trends'>
             <div className='trends__header'>
-              <i className='fa fa-user-plus fa-fw' />
+              <Icon id='user-plus' fixedWidth />
               <FormattedMessage id='suggestions.header' defaultMessage='You might be interested in…' />
             </div>
 
@@ -59,7 +60,7 @@ class SearchResults extends ImmutablePureComponent {
       count   += results.get('accounts').size;
       accounts = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-users' /><FormattedMessage id='search_results.accounts' defaultMessage='People' /></h5>
+          <h5><Icon id='users' fixedWidth /><FormattedMessage id='search_results.accounts' defaultMessage='People' /></h5>
 
           {results.get('accounts').map(accountId => <AccountContainer key={accountId} id={accountId} />)}
         </div>
@@ -70,7 +71,7 @@ class SearchResults extends ImmutablePureComponent {
       count   += results.get('statuses').size;
       statuses = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-quote-right' /><FormattedMessage id='search_results.statuses' defaultMessage='Toots' /></h5>
+          <h5><Icon id='quote-right' fixedWidth /><FormattedMessage id='search_results.statuses' defaultMessage='Toots' /></h5>
 
           {results.get('statuses').map(statusId => <StatusContainer key={statusId} id={statusId} />)}
         </div>
@@ -81,7 +82,7 @@ class SearchResults extends ImmutablePureComponent {
       count += results.get('hashtags').size;
       hashtags = (
         <div className='search-results__section'>
-          <h5><i className='fa fa-fw fa-hashtag' /><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></h5>
+          <h5><Icon id='hashtag' fixedWidth /><FormattedMessage id='search_results.hashtags' defaultMessage='Hashtags' /></h5>
 
           {results.get('hashtags').map(hashtag => <Hashtag key={hashtag.get('name')} hashtag={hashtag} />)}
         </div>
@@ -91,7 +92,7 @@ class SearchResults extends ImmutablePureComponent {
     return (
       <div className='search-results'>
         <div className='search-results__header'>
-          <i className='fa fa-search fa-fw' />
+          <Icon id='search' fixedWidth />
           <FormattedMessage id='search_results.total' defaultMessage='{count, number} {count, plural, one {result} other {results}}' values={{ count }} />
         </div>
 
diff --git a/app/javascript/mastodon/features/compose/components/upload.js b/app/javascript/mastodon/features/compose/components/upload.js
index a1e99dcbbd..038d7ee28a 100644
--- a/app/javascript/mastodon/features/compose/components/upload.js
+++ b/app/javascript/mastodon/features/compose/components/upload.js
@@ -6,6 +6,7 @@ import spring from 'react-motion/lib/spring';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   description: { id: 'upload_form.description', defaultMessage: 'Describe for the visually impaired' },
@@ -99,8 +100,8 @@ class Upload extends ImmutablePureComponent {
           {({ scale }) => (
             <div className='compose-form__upload-thumbnail' style={{ transform: `scale(${scale})`, backgroundImage: `url(${media.get('preview_url')})`, backgroundPosition: `${x}% ${y}%` }}>
               <div className={classNames('compose-form__upload__actions', { active })}>
-                <button className='icon-button' onClick={this.handleUndoClick}><i className='fa fa-times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
-                {media.get('type') === 'image' && <button className='icon-button' onClick={this.handleFocalPointClick}><i className='fa fa-crosshairs' /> <FormattedMessage id='upload_form.focus' defaultMessage='Crop' /></button>}
+                <button className='icon-button' onClick={this.handleUndoClick}><Icon id='times' /> <FormattedMessage id='upload_form.undo' defaultMessage='Delete' /></button>
+                {media.get('type') === 'image' && <button className='icon-button' onClick={this.handleFocalPointClick}><Icon id='crosshairs' /> <FormattedMessage id='upload_form.focus' defaultMessage='Crop' /></button>}
               </div>
 
               <div className={classNames('compose-form__upload-description', { active })}>
diff --git a/app/javascript/mastodon/features/compose/components/upload_progress.js b/app/javascript/mastodon/features/compose/components/upload_progress.js
index d5e6f19cda..cbe58f5739 100644
--- a/app/javascript/mastodon/features/compose/components/upload_progress.js
+++ b/app/javascript/mastodon/features/compose/components/upload_progress.js
@@ -3,6 +3,7 @@ import PropTypes from 'prop-types';
 import Motion from '../../ui/util/optional_motion';
 import spring from 'react-motion/lib/spring';
 import { FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 export default class UploadProgress extends React.PureComponent {
 
@@ -21,7 +22,7 @@ export default class UploadProgress extends React.PureComponent {
     return (
       <div className='upload-progress'>
         <div className='upload-progress__icon'>
-          <i className='fa fa-upload' />
+          <Icon id='upload' />
         </div>
 
         <div className='upload-progress__message'>
diff --git a/app/javascript/mastodon/features/compose/index.js b/app/javascript/mastodon/features/compose/index.js
index d76cd76e61..fff329106d 100644
--- a/app/javascript/mastodon/features/compose/index.js
+++ b/app/javascript/mastodon/features/compose/index.js
@@ -14,6 +14,7 @@ import SearchResultsContainer from './containers/search_results_container';
 import { changeComposing } from '../../actions/compose';
 import elephantUIPlane from '../../../images/elephant_ui_plane.svg';
 import { mascot } from '../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   start: { id: 'getting_started.heading', defaultMessage: 'Getting started' },
@@ -77,21 +78,21 @@ class Compose extends React.PureComponent {
       const { columns } = this.props;
       header = (
         <nav className='drawer__header'>
-          <Link to='/getting-started' className='drawer__tab' title={intl.formatMessage(messages.start)} aria-label={intl.formatMessage(messages.start)}><i role='img' className='fa fa-fw fa-bars' /></Link>
+          <Link to='/getting-started' className='drawer__tab' title={intl.formatMessage(messages.start)} aria-label={intl.formatMessage(messages.start)}><Icon id='bars' fixedWidth /></Link>
           {!columns.some(column => column.get('id') === 'HOME') && (
-            <Link to='/timelines/home' className='drawer__tab' title={intl.formatMessage(messages.home_timeline)} aria-label={intl.formatMessage(messages.home_timeline)}><i role='img' className='fa fa-fw fa-home' /></Link>
+            <Link to='/timelines/home' className='drawer__tab' title={intl.formatMessage(messages.home_timeline)} aria-label={intl.formatMessage(messages.home_timeline)}><Icon id='home' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'NOTIFICATIONS') && (
-            <Link to='/notifications' className='drawer__tab' title={intl.formatMessage(messages.notifications)} aria-label={intl.formatMessage(messages.notifications)}><i role='img' className='fa fa-fw fa-bell' /></Link>
+            <Link to='/notifications' className='drawer__tab' title={intl.formatMessage(messages.notifications)} aria-label={intl.formatMessage(messages.notifications)}><Icon id='bell' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'COMMUNITY') && (
-            <Link to='/timelines/public/local' className='drawer__tab' title={intl.formatMessage(messages.community)} aria-label={intl.formatMessage(messages.community)}><i role='img' className='fa fa-fw fa-users' /></Link>
+            <Link to='/timelines/public/local' className='drawer__tab' title={intl.formatMessage(messages.community)} aria-label={intl.formatMessage(messages.community)}><Icon id='users' fixedWidth /></Link>
           )}
           {!columns.some(column => column.get('id') === 'PUBLIC') && (
-            <Link to='/timelines/public' className='drawer__tab' title={intl.formatMessage(messages.public)} aria-label={intl.formatMessage(messages.public)}><i role='img' className='fa fa-fw fa-globe' /></Link>
+            <Link to='/timelines/public' className='drawer__tab' title={intl.formatMessage(messages.public)} aria-label={intl.formatMessage(messages.public)}><Icon id='globe' fixedWidth /></Link>
           )}
-          <a href='/settings/preferences' className='drawer__tab' title={intl.formatMessage(messages.preferences)} aria-label={intl.formatMessage(messages.preferences)}><i role='img' className='fa fa-fw fa-cog' /></a>
-          <a href='/auth/sign_out' className='drawer__tab' data-method='delete' title={intl.formatMessage(messages.logout)} aria-label={intl.formatMessage(messages.logout)}><i role='img' className='fa fa-fw fa-sign-out' /></a>
+          <a href='/settings/preferences' className='drawer__tab' title={intl.formatMessage(messages.preferences)} aria-label={intl.formatMessage(messages.preferences)}><Icon id='cog' fixedWidth /></a>
+          <a href='/auth/sign_out' className='drawer__tab' data-method='delete' title={intl.formatMessage(messages.logout)} aria-label={intl.formatMessage(messages.logout)}><Icon id='sign-out' fixedWidth /></a>
         </nav>
       );
     }
diff --git a/app/javascript/mastodon/features/getting_started/index.js b/app/javascript/mastodon/features/getting_started/index.js
index 709a3aa96d..e277a73c7a 100644
--- a/app/javascript/mastodon/features/getting_started/index.js
+++ b/app/javascript/mastodon/features/getting_started/index.js
@@ -12,6 +12,7 @@ import { fetchFollowRequests } from '../../actions/accounts';
 import { List as ImmutableList } from 'immutable';
 import { Link } from 'react-router-dom';
 import NavigationBar from '../compose/components/navigation_bar';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   home_timeline: { id: 'tabs_bar.home', defaultMessage: 'Home' },
@@ -140,7 +141,7 @@ class GettingStarted extends ImmutablePureComponent {
         {multiColumn && <div className='column-header__wrapper'>
           <h1 className='column-header'>
             <button>
-              <i className='fa fa-bars fa-fw column-header__icon' />
+              <Icon id='bars' className='column-header__icon' fixedWidth />
               <FormattedMessage id='getting_started.heading' defaultMessage='Getting started' />
             </button>
           </h1>
diff --git a/app/javascript/mastodon/features/list_adder/components/list.js b/app/javascript/mastodon/features/list_adder/components/list.js
index cb8eb7d7a9..60c8958a73 100644
--- a/app/javascript/mastodon/features/list_adder/components/list.js
+++ b/app/javascript/mastodon/features/list_adder/components/list.js
@@ -6,6 +6,7 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import IconButton from '../../../components/icon_button';
 import { defineMessages, injectIntl } from 'react-intl';
 import { removeFromListAdder, addToListAdder } from '../../../actions/lists';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   remove: { id: 'lists.account.remove', defaultMessage: 'Remove from list' },
@@ -53,7 +54,7 @@ class List extends ImmutablePureComponent {
       <div className='list'>
         <div className='list__wrapper'>
           <div className='list__display-name'>
-            <i className='fa fa-fw fa-list-ul column-link__icon' />
+            <Icon id='list-ul' className='column-link__icon' fixedWidth />
             {list.get('title')}
           </div>
 
diff --git a/app/javascript/mastodon/features/list_editor/components/search.js b/app/javascript/mastodon/features/list_editor/components/search.js
index f7617fe587..e3f069bb80 100644
--- a/app/javascript/mastodon/features/list_editor/components/search.js
+++ b/app/javascript/mastodon/features/list_editor/components/search.js
@@ -4,6 +4,7 @@ import { connect } from 'react-redux';
 import { defineMessages, injectIntl } from 'react-intl';
 import { fetchListSuggestions, clearListSuggestions, changeListSuggestions } from '../../../actions/lists';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   search: { id: 'lists.search', defaultMessage: 'Search among people you follow' },
@@ -65,8 +66,8 @@ class Search extends React.PureComponent {
         </label>
 
         <div role='button' tabIndex='0' className='search__icon' onClick={this.handleClear}>
-          <i className={classNames('fa fa-search', { active: !hasValue })} />
-          <i aria-label={intl.formatMessage(messages.search)} className={classNames('fa fa-times-circle', { active: hasValue })} />
+          <Icon id='search' className={classNames({ active: !hasValue })} />
+          <Icon id='times-circle' aria-label={intl.formatMessage(messages.search)} className={classNames({ active: hasValue })} />
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/features/list_timeline/index.js b/app/javascript/mastodon/features/list_timeline/index.js
index 5b047ace48..b6722e91a7 100644
--- a/app/javascript/mastodon/features/list_timeline/index.js
+++ b/app/javascript/mastodon/features/list_timeline/index.js
@@ -14,6 +14,7 @@ import { fetchList, deleteList } from '../../actions/lists';
 import { openModal } from '../../actions/modal';
 import MissingIndicator from '../../components/missing_indicator';
 import LoadingIndicator from '../../components/loading_indicator';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   deleteMessage: { id: 'confirmations.delete_list.message', defaultMessage: 'Are you sure you want to permanently delete this list?' },
@@ -150,11 +151,11 @@ class ListTimeline extends React.PureComponent {
         >
           <div className='column-header__links'>
             <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleEditClick}>
-              <i className='fa fa-pencil' /> <FormattedMessage id='lists.edit' defaultMessage='Edit list' />
+              <Icon id='pencil' /> <FormattedMessage id='lists.edit' defaultMessage='Edit list' />
             </button>
 
             <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.handleDeleteClick}>
-              <i className='fa fa-trash' /> <FormattedMessage id='lists.delete' defaultMessage='Delete list' />
+              <Icon id='trash' /> <FormattedMessage id='lists.delete' defaultMessage='Delete list' />
             </button>
           </div>
 
diff --git a/app/javascript/mastodon/features/notifications/components/clear_column_button.js b/app/javascript/mastodon/features/notifications/components/clear_column_button.js
index e0bf4c82d5..b82fd092f8 100644
--- a/app/javascript/mastodon/features/notifications/components/clear_column_button.js
+++ b/app/javascript/mastodon/features/notifications/components/clear_column_button.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 export default class ClearColumnButton extends React.PureComponent {
 
@@ -10,7 +11,7 @@ export default class ClearColumnButton extends React.PureComponent {
 
   render () {
     return (
-      <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.props.onClick}><i className='fa fa-eraser' /> <FormattedMessage id='notifications.clear' defaultMessage='Clear notifications' /></button>
+      <button className='text-btn column-header__setting-btn' tabIndex='0' onClick={this.props.onClick}><Icon id='eraser' /> <FormattedMessage id='notifications.clear' defaultMessage='Clear notifications' /></button>
     );
   }
 
diff --git a/app/javascript/mastodon/features/notifications/components/filter_bar.js b/app/javascript/mastodon/features/notifications/components/filter_bar.js
index f95a2c9dea..6ae8b7491a 100644
--- a/app/javascript/mastodon/features/notifications/components/filter_bar.js
+++ b/app/javascript/mastodon/features/notifications/components/filter_bar.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
+import Icon from 'mastodon/components/icon';
 
 const tooltips = defineMessages({
   mentions: { id: 'notifications.filter.mentions', defaultMessage: 'Mentions' },
@@ -62,28 +63,28 @@ class FilterBar extends React.PureComponent {
           onClick={this.onClick('mention')}
           title={intl.formatMessage(tooltips.mentions)}
         >
-          <i className='fa fa-fw fa-at' />
+          <Icon id='at' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'favourite' ? 'active' : ''}
           onClick={this.onClick('favourite')}
           title={intl.formatMessage(tooltips.favourites)}
         >
-          <i className='fa fa-fw fa-star' />
+          <Icon id='star' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'reblog' ? 'active' : ''}
           onClick={this.onClick('reblog')}
           title={intl.formatMessage(tooltips.boosts)}
         >
-          <i className='fa fa-fw fa-retweet' />
+          <Icon id='retweet' fixedWidth />
         </button>
         <button
           className={selectedFilter === 'follow' ? 'active' : ''}
           onClick={this.onClick('follow')}
           title={intl.formatMessage(tooltips.follows)}
         >
-          <i className='fa fa-fw fa-user-plus' />
+          <Icon id='user-plus' fixedWidth />
         </button>
       </div>
     );
diff --git a/app/javascript/mastodon/features/notifications/components/notification.js b/app/javascript/mastodon/features/notifications/components/notification.js
index 97efff69c8..0bd8d47c39 100644
--- a/app/javascript/mastodon/features/notifications/components/notification.js
+++ b/app/javascript/mastodon/features/notifications/components/notification.js
@@ -7,6 +7,7 @@ import { injectIntl, FormattedMessage } from 'react-intl';
 import Permalink from '../../../components/permalink';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import { HotKeys } from 'react-hotkeys';
+import Icon from 'mastodon/components/icon';
 
 const notificationForScreenReader = (intl, message, timestamp) => {
   const output = [message];
@@ -105,7 +106,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-follow focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.follow', defaultMessage: '{name} followed you' }, { name: account.get('acct') }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-user-plus' />
+              <Icon id='user-plus' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
@@ -140,7 +141,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-favourite focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.favourite', defaultMessage: '{name} favourited your status' }, { name: notification.getIn(['account', 'acct']) }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-star star-icon' />
+              <Icon id='star' className='star-icon' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
@@ -162,7 +163,7 @@ class Notification extends ImmutablePureComponent {
         <div className='notification notification-reblog focusable' tabIndex='0' aria-label={notificationForScreenReader(intl, intl.formatMessage({ id: 'notification.reblog', defaultMessage: '{name} boosted your status' }, { name: notification.getIn(['account', 'acct']) }), notification.get('created_at'))}>
           <div className='notification__message'>
             <div className='notification__favourite-icon-wrapper'>
-              <i className='fa fa-fw fa-retweet' />
+              <Icon id='retweet' fixedWidth />
             </div>
 
             <span title={notification.get('created_at')}>
diff --git a/app/javascript/mastodon/features/status/components/card.js b/app/javascript/mastodon/features/status/components/card.js
index 8491299ef4..8237de84d3 100644
--- a/app/javascript/mastodon/features/status/components/card.js
+++ b/app/javascript/mastodon/features/status/components/card.js
@@ -4,6 +4,7 @@ import Immutable from 'immutable';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import punycode from 'punycode';
 import classnames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 const IDNA_PREFIX = 'xn--';
 
@@ -175,8 +176,8 @@ export default class Card extends React.PureComponent {
 
             <div className='status-card__actions'>
               <div>
-                <button onClick={this.handleEmbedClick}><i className={`fa fa-${iconVariant}`} /></button>
-                {horizontal && <a href={card.get('url')} target='_blank' rel='noopener'><i className='fa fa-external-link' /></a>}
+                <button onClick={this.handleEmbedClick}><Icon id={iconVariant} /></button>
+                {horizontal && <a href={card.get('url')} target='_blank' rel='noopener'><Icon id='external-link' /></a>}
               </div>
             </div>
           </div>
@@ -198,7 +199,7 @@ export default class Card extends React.PureComponent {
     } else {
       embed = (
         <div className='status-card__image'>
-          <i className='fa fa-file-text' />
+          <Icon id='file-text' />
         </div>
       );
     }
diff --git a/app/javascript/mastodon/features/status/components/detailed_status.js b/app/javascript/mastodon/features/status/components/detailed_status.js
index 0630387d29..734353c9bd 100644
--- a/app/javascript/mastodon/features/status/components/detailed_status.js
+++ b/app/javascript/mastodon/features/status/components/detailed_status.js
@@ -13,6 +13,7 @@ import ImmutablePureComponent from 'react-immutable-pure-component';
 import Video from '../../video';
 import scheduleIdleTask from '../../ui/util/schedule_idle_task';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class DetailedStatus extends ImmutablePureComponent {
 
@@ -148,11 +149,11 @@ export default class DetailedStatus extends ImmutablePureComponent {
     }
 
     if (status.get('visibility') === 'private') {
-      reblogLink = <i className={`fa fa-${reblogIcon}`} />;
+      reblogLink = <Icon id={reblogIcon} />;
     } else if (this.context.router) {
       reblogLink = (
         <Link to={`/statuses/${status.get('id')}/reblogs`} className='detailed-status__link'>
-          <i className={`fa fa-${reblogIcon}`} />
+          <Icon id={reblogIcon} />
           <span className='detailed-status__reblogs'>
             <FormattedNumber value={status.get('reblogs_count')} />
           </span>
@@ -161,7 +162,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     } else {
       reblogLink = (
         <a href={`/interact/${status.get('id')}?type=reblog`} className='detailed-status__link' onClick={this.handleModalLink}>
-          <i className={`fa fa-${reblogIcon}`} />
+          <Icon id={reblogIcon} />
           <span className='detailed-status__reblogs'>
             <FormattedNumber value={status.get('reblogs_count')} />
           </span>
@@ -172,7 +173,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     if (this.context.router) {
       favouriteLink = (
         <Link to={`/statuses/${status.get('id')}/favourites`} className='detailed-status__link'>
-          <i className='fa fa-star' />
+          <Icon id='star' />
           <span className='detailed-status__favorites'>
             <FormattedNumber value={status.get('favourites_count')} />
           </span>
@@ -181,7 +182,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     } else {
       favouriteLink = (
         <a href={`/interact/${status.get('id')}?type=favourite`} className='detailed-status__link' onClick={this.handleModalLink}>
-          <i className='fa fa-star' />
+          <Icon id='star' />
           <span className='detailed-status__favorites'>
             <FormattedNumber value={status.get('favourites_count')} />
           </span>
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index d48b682ebb..3b5febcac4 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -44,6 +44,7 @@ import { HotKeys } from 'react-hotkeys';
 import { boostModal, deleteModal } from '../../initial_state';
 import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../ui/util/fullscreen';
 import { textForScreenReader } from '../../components/status';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
@@ -425,7 +426,7 @@ class Status extends ImmutablePureComponent {
         <ColumnHeader
           showBackButton
           extraButton={(
-            <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><i className={`fa fa-${status.get('hidden') ? 'eye-slash' : 'eye'}`} /></button>
+            <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><Icon id={status.get('hidden') ? 'eye-slash' : 'eye'} /></button>
           )}
         />
 
diff --git a/app/javascript/mastodon/features/ui/components/boost_modal.js b/app/javascript/mastodon/features/ui/components/boost_modal.js
index b128e67d23..920e93d404 100644
--- a/app/javascript/mastodon/features/ui/components/boost_modal.js
+++ b/app/javascript/mastodon/features/ui/components/boost_modal.js
@@ -8,6 +8,7 @@ import Avatar from '../../../components/avatar';
 import RelativeTimestamp from '../../../components/relative_timestamp';
 import DisplayName from '../../../components/display_name';
 import ImmutablePureComponent from 'react-immutable-pure-component';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   reblog: { id: 'status.reblog', defaultMessage: 'Boost' },
@@ -74,7 +75,7 @@ class BoostModal extends ImmutablePureComponent {
         </div>
 
         <div className='boost-modal__action-bar'>
-          <div><FormattedMessage id='boost_modal.combo' defaultMessage='You can press {combo} to skip this next time' values={{ combo: <span>Shift + <i className='fa fa-retweet' /></span> }} /></div>
+          <div><FormattedMessage id='boost_modal.combo' defaultMessage='You can press {combo} to skip this next time' values={{ combo: <span>Shift + <Icon id='retweet' /></span> }} /></div>
           <Button text={intl.formatMessage(messages.reblog)} onClick={this.handleReblog} ref={this.setRef} />
         </div>
       </div>
diff --git a/app/javascript/mastodon/features/ui/components/column_header.js b/app/javascript/mastodon/features/ui/components/column_header.js
index e8bdd8054f..b1a36e173d 100644
--- a/app/javascript/mastodon/features/ui/components/column_header.js
+++ b/app/javascript/mastodon/features/ui/components/column_header.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import classNames from 'classnames';
+import Icon from 'mastodon/components/icon';
 
 export default class ColumnHeader extends React.PureComponent {
 
@@ -21,7 +22,7 @@ export default class ColumnHeader extends React.PureComponent {
     let iconElement = '';
 
     if (icon) {
-      iconElement = <i className={`fa fa-fw fa-${icon} column-header__icon`} />;
+      iconElement = <Icon id={icon} fixedWidth className='column-header__icon' />;
     }
 
     return (
diff --git a/app/javascript/mastodon/features/ui/components/column_link.js b/app/javascript/mastodon/features/ui/components/column_link.js
index 25c2d1cf86..0a25f1ea20 100644
--- a/app/javascript/mastodon/features/ui/components/column_link.js
+++ b/app/javascript/mastodon/features/ui/components/column_link.js
@@ -1,6 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { Link } from 'react-router-dom';
+import Icon from 'mastodon/components/icon';
 
 const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   const badgeElement = typeof badge !== 'undefined' ? <span className='column-link__badge'>{badge}</span> : null;
@@ -8,7 +9,7 @@ const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   if (href) {
     return (
       <a href={href} className='column-link' data-method={method}>
-        <i className={`fa fa-fw fa-${icon} column-link__icon`} />
+        <Icon id={icon} fixedWidth className='column-link__icon' />
         {text}
         {badgeElement}
       </a>
@@ -16,7 +17,7 @@ const ColumnLink = ({ icon, text, to, href, method, badge }) => {
   } else {
     return (
       <Link to={to} className='column-link'>
-        <i className={`fa fa-fw fa-${icon} column-link__icon`} />
+        <Icon id={icon} fixedWidth className='column-link__icon' />
         {text}
         {badgeElement}
       </Link>
diff --git a/app/javascript/mastodon/features/ui/components/columns_area.js b/app/javascript/mastodon/features/ui/components/columns_area.js
index b7e350cbce..63feeac450 100644
--- a/app/javascript/mastodon/features/ui/components/columns_area.js
+++ b/app/javascript/mastodon/features/ui/components/columns_area.js
@@ -13,6 +13,7 @@ import ColumnLoading from './column_loading';
 import DrawerLoading from './drawer_loading';
 import BundleColumnError from './bundle_column_error';
 import { Compose, Notifications, HomeTimeline, CommunityTimeline, PublicTimeline, HashtagTimeline, DirectTimeline, FavouritedStatuses, ListTimeline } from '../../ui/util/async-components';
+import Icon from 'mastodon/components/icon';
 
 import detectPassiveEvents from 'detect-passive-events';
 import { scrollRight } from '../../../scroll';
@@ -160,7 +161,7 @@ class ColumnsArea extends ImmutablePureComponent {
     this.pendingIndex = null;
 
     if (singleColumn) {
-      const floatingActionButton = shouldHideFAB(this.context.router.history.location.pathname) ? null : <Link key='floating-action-button' to='/statuses/new' className='floating-action-button' aria-label={intl.formatMessage(messages.publish)}><i className='fa fa-pencil' /></Link>;
+      const floatingActionButton = shouldHideFAB(this.context.router.history.location.pathname) ? null : <Link key='floating-action-button' to='/statuses/new' className='floating-action-button' aria-label={intl.formatMessage(messages.publish)}><Icon id='pencil' /></Link>;
 
       return columnIndex !== -1 ? [
         <ReactSwipeableViews key='content' index={columnIndex} onChangeIndex={this.handleSwipe} onTransitionEnd={this.handleAnimationEnd} animateTransitions={shouldAnimate} springConfig={{ duration: '400ms', delay: '0s', easeFunction: 'ease' }} style={{ height: '100%' }}>
diff --git a/app/javascript/mastodon/features/ui/components/media_modal.js b/app/javascript/mastodon/features/ui/components/media_modal.js
index d29a4a6a7d..2120746da3 100644
--- a/app/javascript/mastodon/features/ui/components/media_modal.js
+++ b/app/javascript/mastodon/features/ui/components/media_modal.js
@@ -9,6 +9,7 @@ import { defineMessages, injectIntl } from 'react-intl';
 import IconButton from '../../../components/icon_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import ImageLoader from './image_loader';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   close: { id: 'lightbox.close', defaultMessage: 'Close' },
@@ -108,8 +109,8 @@ class MediaModal extends ImmutablePureComponent {
     const index = this.getIndex();
     let pagination = [];
 
-    const leftNav  = media.size > 1 && <button tabIndex='0' className='media-modal__nav media-modal__nav--left' onClick={this.handlePrevClick} aria-label={intl.formatMessage(messages.previous)}><i className='fa fa-fw fa-chevron-left' /></button>;
-    const rightNav = media.size > 1 && <button tabIndex='0' className='media-modal__nav  media-modal__nav--right' onClick={this.handleNextClick} aria-label={intl.formatMessage(messages.next)}><i className='fa fa-fw fa-chevron-right' /></button>;
+    const leftNav  = media.size > 1 && <button tabIndex='0' className='media-modal__nav media-modal__nav--left' onClick={this.handlePrevClick} aria-label={intl.formatMessage(messages.previous)}><Icon id='chevron-left' fixedWidth /></button>;
+    const rightNav = media.size > 1 && <button tabIndex='0' className='media-modal__nav  media-modal__nav--right' onClick={this.handleNextClick} aria-label={intl.formatMessage(messages.next)}><Icon id='chevron-right' fixedWidth /></button>;
 
     if (media.size > 1) {
       pagination = media.map((item, i) => {
diff --git a/app/javascript/mastodon/features/ui/components/tabs_bar.js b/app/javascript/mastodon/features/ui/components/tabs_bar.js
index 16236ea51e..1b2bb77810 100644
--- a/app/javascript/mastodon/features/ui/components/tabs_bar.js
+++ b/app/javascript/mastodon/features/ui/components/tabs_bar.js
@@ -4,16 +4,17 @@ import { NavLink, withRouter } from 'react-router-dom';
 import { FormattedMessage, injectIntl } from 'react-intl';
 import { debounce } from 'lodash';
 import { isUserTouching } from '../../../is_mobile';
+import Icon from 'mastodon/components/icon';
 
 export const links = [
-  <NavLink className='tabs-bar__link primary' to='/timelines/home' data-preview-title-id='column.home' data-preview-icon='home' ><i className='fa fa-fw fa-home' /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
-  <NavLink className='tabs-bar__link primary' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><i className='fa fa-fw fa-bell' /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/timelines/home' data-preview-title-id='column.home' data-preview-icon='home' ><Icon id='home' fixedWidth /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><Icon id='bell' fixedWidth /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
 
-  <NavLink className='tabs-bar__link secondary' to='/timelines/public/local' data-preview-title-id='column.community' data-preview-icon='users' ><i className='fa fa-fw fa-users' /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
-  <NavLink className='tabs-bar__link secondary' exact to='/timelines/public' data-preview-title-id='column.public' data-preview-icon='globe' ><i className='fa fa-fw fa-globe' /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
-  <NavLink className='tabs-bar__link primary' to='/search' data-preview-title-id='tabs_bar.search' data-preview-icon='bell' ><i className='fa fa-fw fa-search' /><FormattedMessage id='tabs_bar.search' defaultMessage='Search' /></NavLink>,
+  <NavLink className='tabs-bar__link secondary' to='/timelines/public/local' data-preview-title-id='column.community' data-preview-icon='users' ><Icon id='users' fixedWidth /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
+  <NavLink className='tabs-bar__link secondary' exact to='/timelines/public' data-preview-title-id='column.public' data-preview-icon='globe' ><Icon id='globe' fixedWidth /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' to='/search' data-preview-title-id='tabs_bar.search' data-preview-icon='bell' ><Icon id='search' fixedWidth /><FormattedMessage id='tabs_bar.search' defaultMessage='Search' /></NavLink>,
 
-  <NavLink className='tabs-bar__link primary' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started' data-preview-title-id='getting_started.heading' data-preview-icon='bars' ><i className='fa fa-fw fa-bars' /></NavLink>,
+  <NavLink className='tabs-bar__link primary' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started' data-preview-title-id='getting_started.heading' data-preview-icon='bars' ><Icon id='bars' fixedWidth /></NavLink>,
 ];
 
 export function getIndex (path) {
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 0d0c24d719..15a5de4b80 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -6,6 +6,7 @@ import { throttle } from 'lodash';
 import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from '../ui/util/fullscreen';
 import { displayMedia } from '../../initial_state';
+import Icon from 'mastodon/components/icon';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -416,8 +417,8 @@ class Video extends React.PureComponent {
 
           <div className='video-player__buttons-bar'>
             <div className='video-player__buttons left'>
-              <button type='button' aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><i className={classNames('fa fa-fw', { 'fa-play': paused, 'fa-pause': !paused })} /></button>
-              <button type='button' aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><i className={classNames('fa fa-fw', { 'fa-volume-off': muted, 'fa-volume-up': !muted })} /></button>
+              <button type='button' aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><Icon id={paused ? 'play' : 'pause'} fixedWidth /></button>
+              <button type='button' aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><Icon id={muted ? 'volume-off' : 'volume-up'} fixedWidth /></button>
               <div className='video-player__volume' onMouseDown={this.handleVolumeMouseDown} ref={this.setVolumeRef}>
                 <div className='video-player__volume__current' style={{ width: `${volumeWidth}px` }} />
                 <span
@@ -437,10 +438,10 @@ class Video extends React.PureComponent {
             </div>
 
             <div className='video-player__buttons right'>
-              {!onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.hide)} onClick={this.toggleReveal}><i className='fa fa-fw fa-eye' /></button>}
-              {(!fullscreen && onOpenVideo) && <button type='button' aria-label={intl.formatMessage(messages.expand)} onClick={this.handleOpenVideo}><i className='fa fa-fw fa-expand' /></button>}
-              {onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.close)} onClick={this.handleCloseVideo}><i className='fa fa-fw fa-compress' /></button>}
-              <button type='button' aria-label={intl.formatMessage(fullscreen ? messages.exit_fullscreen : messages.fullscreen)} onClick={this.toggleFullscreen}><i className={classNames('fa fa-fw', { 'fa-arrows-alt': !fullscreen, 'fa-compress': fullscreen })} /></button>
+              {!onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.hide)} onClick={this.toggleReveal}><Icon id='eye' fixedWidth /></button>}
+              {(!fullscreen && onOpenVideo) && <button type='button' aria-label={intl.formatMessage(messages.expand)} onClick={this.handleOpenVideo}><Icon id='expand' fixedWidth /></button>}
+              {onCloseVideo && <button type='button' aria-label={intl.formatMessage(messages.close)} onClick={this.handleCloseVideo}><Icon id='compress' fixedWidth /></button>}
+              <button type='button' aria-label={intl.formatMessage(fullscreen ? messages.exit_fullscreen : messages.fullscreen)} onClick={this.toggleFullscreen}><Icon id={fullscreen ? 'compress' : 'arrows-alt'} fixedWidth /></button>
             </div>
           </div>
         </div>
diff --git a/jest.config.js b/jest.config.js
index 50bde57e65..85f8b1be9c 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -22,4 +22,8 @@ module.exports = {
     '!app/javascript/mastodon/test_setup.js',
   ],
   coverageDirectory: '<rootDir>/coverage',
+  moduleDirectories: [
+    '<rootDir>/node_modules',
+    '<rootDir>/app/javascript',
+  ],
 };