diff --git a/framework/core/js/src/common/Application.tsx b/framework/core/js/src/common/Application.tsx
index 6dd4fe922..36af01500 100644
--- a/framework/core/js/src/common/Application.tsx
+++ b/framework/core/js/src/common/Application.tsx
@@ -33,6 +33,7 @@ import type Mithril from 'mithril';
 import type Component from './Component';
 import type { ComponentAttrs } from './Component';
 import Model, { SavedModelData } from './Model';
+import fireApplicationError from './helpers/fireApplicationError';
 
 export type FlarumScreens = 'phone' | 'tablet' | 'desktop' | 'desktop-hd';
 
@@ -262,7 +263,25 @@ export default class Application {
   }
 
   public boot() {
-    this.initializers.toArray().forEach((initializer) => initializer(this));
+    const caughtInitializationErrors: CallableFunction[] = [];
+
+    this.initializers.toArray().forEach((initializer) => {
+      try {
+        initializer(this);
+      } catch (e) {
+        const extension = initializer.itemName.includes('/')
+          ? initializer.itemName.replace(/(\/flarum-ext-)|(\/flarum-)/g, '-')
+          : initializer.itemName;
+
+        caughtInitializationErrors.push(() =>
+          fireApplicationError(
+            extractText(app.translator.trans('core.lib.error.extension_initialiation_failed_message', { extension })),
+            `${extension} failed to initialize`,
+            e
+          )
+        );
+      }
+    });
 
     this.store.pushPayload({ data: this.data.resources });
 
@@ -273,6 +292,8 @@ export default class Application {
     this.mount();
 
     this.initialRoute = window.location.href;
+
+    caughtInitializationErrors.forEach((handler) => handler());
   }
 
   // TODO: This entire system needs a do-over for v2
diff --git a/framework/core/js/src/common/helpers/fireApplicationError.ts b/framework/core/js/src/common/helpers/fireApplicationError.ts
new file mode 100644
index 000000000..b4e8c9e85
--- /dev/null
+++ b/framework/core/js/src/common/helpers/fireApplicationError.ts
@@ -0,0 +1,18 @@
+import app from '../app';
+
+/**
+ * Fire a Flarum error which is shown in the JS console for everyone and in an alert for the admin.
+ *
+ * @param userTitle: a user friendly title of the error, should be localized.
+ * @param consoleTitle: an error title that goes in the console, doesn't have to be localized.
+ * @param error: the error.
+ */
+export default function fireApplicationError(userTitle: string, consoleTitle: string, error: any) {
+  console.group(`%c${consoleTitle}`, 'background-color: #d83e3e; color: #ffffff; font-weight: bold;');
+  console.error(error);
+  console.groupEnd();
+
+  if (app.session?.user?.isAdmin()) {
+    app.alerts.show({ type: 'error' }, `${userTitle}`);
+  }
+}
diff --git a/framework/core/js/src/common/models/User.tsx b/framework/core/js/src/common/models/User.tsx
index c1f6a9830..8b2042b3e 100644
--- a/framework/core/js/src/common/models/User.tsx
+++ b/framework/core/js/src/common/models/User.tsx
@@ -42,6 +42,10 @@ export default class User extends Model {
     return Model.hasMany<Group>('groups').call(this);
   }
 
+  isAdmin() {
+    return Model.attribute<boolean | undefined>('isAdmin').call(this);
+  }
+
   joinTime() {
     return Model.attribute('joinTime', Model.transformDate).call(this);
   }
diff --git a/framework/core/locale/core.yml b/framework/core/locale/core.yml
index e634f5ad8..037e8c1f1 100644
--- a/framework/core/locale/core.yml
+++ b/framework/core/locale/core.yml
@@ -534,6 +534,7 @@ core:
     # These translations are displayed as error messages.
     error:
       dependent_extensions_message: "Cannot disable {extension} until the following dependent extensions are disabled: {extensions}"
+      extension_initialiation_failed_message: "{extension} failed to initialize, check the browser console for further information."
       generic_message: "Oops! Something went wrong. Please reload the page and try again."
       missing_dependencies_message: "Cannot enable {extension} until the following dependencies are enabled: {extensions}"
       not_found_message: The requested resource was not found.
diff --git a/framework/core/src/Api/Serializer/CurrentUserSerializer.php b/framework/core/src/Api/Serializer/CurrentUserSerializer.php
index c8b5cd1cb..24a9417a7 100644
--- a/framework/core/src/Api/Serializer/CurrentUserSerializer.php
+++ b/framework/core/src/Api/Serializer/CurrentUserSerializer.php
@@ -25,7 +25,8 @@ class CurrentUserSerializer extends UserSerializer
             'markedAllAsReadAt'        => $this->formatDate($user->marked_all_as_read_at),
             'unreadNotificationCount'  => (int) $user->getUnreadNotificationCount(),
             'newNotificationCount'     => (int) $user->getNewNotificationCount(),
-            'preferences'              => (array) $user->preferences
+            'preferences'              => (array) $user->preferences,
+            'isAdmin'                  => $user->isAdmin(),
         ];
 
         return $attributes;