diff --git a/app/javascript/mastodon/actions/push_notifications/index.js b/app/javascript/mastodon/actions/push_notifications/index.js
index 2ffec500a9..9dcc4bd4bb 100644
--- a/app/javascript/mastodon/actions/push_notifications/index.js
+++ b/app/javascript/mastodon/actions/push_notifications/index.js
@@ -1,19 +1,5 @@
-import {
-  SET_BROWSER_SUPPORT,
-  SET_SUBSCRIPTION,
-  CLEAR_SUBSCRIPTION,
-  SET_ALERTS,
-  setAlerts,
-} from './setter';
-import { register, saveSettings } from './registerer';
-
-export {
-  SET_BROWSER_SUPPORT,
-  SET_SUBSCRIPTION,
-  CLEAR_SUBSCRIPTION,
-  SET_ALERTS,
-  register,
-};
+import { setAlerts } from './setter';
+import { saveSettings } from './registerer';
 
 export function changeAlerts(path, value) {
   return dispatch => {
@@ -21,3 +7,11 @@ export function changeAlerts(path, value) {
     dispatch(saveSettings());
   };
 }
+
+export {
+  CLEAR_SUBSCRIPTION,
+  SET_BROWSER_SUPPORT,
+  SET_SUBSCRIPTION,
+  SET_ALERTS,
+} from './setter';
+export { register } from './registerer';
diff --git a/app/javascript/mastodon/main.js b/app/javascript/mastodon/main.js
index a66975bfd6..f33375b502 100644
--- a/app/javascript/mastodon/main.js
+++ b/app/javascript/mastodon/main.js
@@ -1,12 +1,14 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import * as registerPushNotifications from 'mastodon/actions/push_notifications';
 import { setupBrowserNotifications } from 'mastodon/actions/notifications';
 import Mastodon, { store } from 'mastodon/containers/mastodon';
 import ready from 'mastodon/ready';
 
-const perf = require('./performance');
+const perf = require('mastodon/performance');
 
+/**
+ * @returns {Promise<void>}
+ */
 function main() {
   perf.start('main()');
 
@@ -18,7 +20,7 @@ function main() {
     }
   }
 
-  ready(() => {
+  return ready(async () => {
     const mountNode = document.getElementById('mastodon');
     const props = JSON.parse(mountNode.getAttribute('data-props'));
 
@@ -26,19 +28,28 @@ function main() {
     store.dispatch(setupBrowserNotifications());
 
     if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
-      import('workbox-window')
-        .then(({ Workbox }) => {
-          const wb = new Workbox('/sw.js');
-
-          return wb.register();
-        })
-        .then(() => {
-          store.dispatch(registerPushNotifications.register());
-        })
-        .catch(err => {
-          console.error(err);
-        });
+      const [{ Workbox }, { me }] = await Promise.all([
+        import('workbox-window'),
+        import('mastodon/initial_state'),
+      ]);
+
+      const wb = new Workbox('/sw.js');
+
+      try {
+        await wb.register();
+      } catch (err) {
+        console.error(err);
+
+        return;
+      }
+
+      if (me) {
+        const registerPushNotifications = await import('mastodon/actions/push_notifications');
+
+        store.dispatch(registerPushNotifications.register());
+      }
     }
+
     perf.stop('main()');
   });
 }
diff --git a/app/javascript/mastodon/ready.js b/app/javascript/mastodon/ready.js
index dd543910bb..e769cc7560 100644
--- a/app/javascript/mastodon/ready.js
+++ b/app/javascript/mastodon/ready.js
@@ -1,7 +1,32 @@
-export default function ready(loaded) {
-  if (['interactive', 'complete'].includes(document.readyState)) {
-    loaded();
-  } else {
-    document.addEventListener('DOMContentLoaded', loaded);
-  }
+// @ts-check
+
+/**
+ * @param {(() => void) | (() => Promise<void>)} callback
+ * @returns {Promise<void>}
+ */
+export default function ready(callback) {
+  return new Promise((resolve, reject) => {
+    function loaded() {
+      let result;
+      try {
+        result = callback();
+      } catch (err) {
+        reject(err);
+
+        return;
+      }
+
+      if (typeof result?.then === 'function') {
+        result.then(resolve).catch(reject);
+      } else {
+        resolve();
+      }
+    }
+
+    if (['interactive', 'complete'].includes(document.readyState)) {
+      loaded();
+    } else {
+      document.addEventListener('DOMContentLoaded', loaded);
+    }
+  });
 }
diff --git a/app/javascript/packs/application.js b/app/javascript/packs/application.js
index 91240aecfb..0851f69b68 100644
--- a/app/javascript/packs/application.js
+++ b/app/javascript/packs/application.js
@@ -4,8 +4,10 @@ import { start } from '../mastodon/common';
 
 start();
 
-loadPolyfills().then(() => {
-  require('../mastodon/main').default();
+loadPolyfills().then(async () => {
+  const { default: main } = import('mastodon/main');
+
+  return main();
 }).catch(e => {
   console.error(e);
 });
diff --git a/yarn.lock b/yarn.lock
index 3628dd5608..44ca29f4b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3211,15 +3211,10 @@ caniuse-api@^3.0.0:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001109, caniuse-lite@^1.0.30001219:
-  version "1.0.30001310"
-  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001310.tgz#da02cd07432c9eece6992689d1b84ca18139eea8"
-  integrity sha512-cb9xTV8k9HTIUA3GnPUJCk0meUnrHL5gy5QePfDjxHyNBcnzPzrHFv5GqfP7ue5b1ZyzZL0RJboD6hQlPXjhjg==
-
-caniuse-lite@^1.0.30001400:
-  version "1.0.30001406"
-  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001406.tgz#d0146e7919635479f873b4507517b627f66ab269"
-  integrity sha512-bWTlaXUy/rq0BBtYShc/jArYfBPjEV95euvZ8JVtO43oQExEN/WquoqpufFjNu4kSpi5cy5kMbNvzztWDfv1Jg==
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30001109, caniuse-lite@^1.0.30001219, caniuse-lite@^1.0.30001400:
+  version "1.0.30001414"
+  resolved "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001414.tgz"
+  integrity sha512-t55jfSaWjCdocnFdKQoO+d2ct9C59UZg4dY3OnUlSZ447r8pUtIKdp0hpAzrGFultmTC+Us+KpKi4GZl/LXlFg==
 
 chalk@^1.1.3:
   version "1.1.3"