diff --git a/framework/core/src/Database/Console/MigrateCommand.php b/framework/core/src/Database/Console/MigrateCommand.php
index 6340b3d67..1e0f1b051 100644
--- a/framework/core/src/Database/Console/MigrateCommand.php
+++ b/framework/core/src/Database/Console/MigrateCommand.php
@@ -67,11 +67,7 @@ class MigrateCommand extends AbstractCommand
         $extensions = $this->container->make('Flarum\Extension\ExtensionManager');
         $extensions->getMigrator()->setOutput($this->output);
 
-        foreach ($extensions->getExtensions() as $name => $extension) {
-            if (! $extension->isEnabled()) {
-                continue;
-            }
-
+        foreach ($extensions->getEnabledExtensions() as $name => $extension) {
             $this->info('Migrating extension: '.$name);
 
             $extensions->migrate($extension);
diff --git a/framework/core/src/Extend/Compat.php b/framework/core/src/Extend/Compat.php
index a50d89191..3f1b0b88e 100644
--- a/framework/core/src/Extend/Compat.php
+++ b/framework/core/src/Extend/Compat.php
@@ -32,7 +32,7 @@ class Compat implements ExtenderInterface
         $this->callback = $callback;
     }
 
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         $container->call($this->callback);
     }
diff --git a/framework/core/src/Extend/ExtenderInterface.php b/framework/core/src/Extend/ExtenderInterface.php
index 6f9bfc7c9..26c58fa92 100644
--- a/framework/core/src/Extend/ExtenderInterface.php
+++ b/framework/core/src/Extend/ExtenderInterface.php
@@ -16,5 +16,5 @@ use Illuminate\Contracts\Container\Container;
 
 interface ExtenderInterface
 {
-    public function __invoke(Container $container, Extension $extension = null);
+    public function extend(Container $container, Extension $extension = null);
 }
diff --git a/framework/core/src/Extend/Formatter.php b/framework/core/src/Extend/Formatter.php
index 13245db4a..1ae2a6ed8 100644
--- a/framework/core/src/Extend/Formatter.php
+++ b/framework/core/src/Extend/Formatter.php
@@ -11,15 +11,13 @@
 
 namespace Flarum\Extend;
 
-use Flarum\Extension\Event\Disabled;
-use Flarum\Extension\Event\Enabled;
 use Flarum\Extension\Extension;
 use Flarum\Formatter\Event\Configuring;
 use Flarum\Formatter\Formatter as ActualFormatter;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Events\Dispatcher;
 
-class Formatter implements ExtenderInterface
+class Formatter implements ExtenderInterface, LifecycleInterface
 {
     protected $callback;
 
@@ -30,7 +28,7 @@ class Formatter implements ExtenderInterface
         return $this;
     }
 
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         $events = $container->make(Dispatcher::class);
 
@@ -40,16 +38,17 @@ class Formatter implements ExtenderInterface
                 call_user_func($this->callback, $event->configurator);
             }
         );
+    }
 
-        // Also set up an event listener to flush the formatter cache whenever
-        // this extension is enabled or disabled.
-        $events->listen(
-            [Enabled::class, Disabled::class],
-            function ($event) use ($container, $extension) {
-                if ($event->extension === $extension) {
-                    $container->make(ActualFormatter::class)->flush();
-                }
-            }
-        );
+    public function onEnable(Container $container, Extension $extension)
+    {
+        // FLush the formatter cache when this extension is enabled
+        $container->make(ActualFormatter::class)->flush();
+    }
+
+    public function onDisable(Container $container, Extension $extension)
+    {
+        // FLush the formatter cache when this extension is disabled
+        $container->make(ActualFormatter::class)->flush();
     }
 }
diff --git a/framework/core/src/Extend/Frontend.php b/framework/core/src/Extend/Frontend.php
index 45282316a..1b77d541b 100644
--- a/framework/core/src/Extend/Frontend.php
+++ b/framework/core/src/Extend/Frontend.php
@@ -51,7 +51,7 @@ class Frontend implements ExtenderInterface
         return $this;
     }
 
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         $this->registerAssets($container, $this->getModuleName($extension));
         $this->registerRoutes($container);
diff --git a/framework/core/src/Extend/LanguagePack.php b/framework/core/src/Extend/LanguagePack.php
index c8a7f0c09..e579bfaee 100644
--- a/framework/core/src/Extend/LanguagePack.php
+++ b/framework/core/src/Extend/LanguagePack.php
@@ -20,7 +20,7 @@ use RuntimeException;
 
 class LanguagePack implements ExtenderInterface
 {
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         if (is_null($extension)) {
             throw new InvalidArgumentException(
diff --git a/framework/core/src/Extend/LifecycleInterface.php b/framework/core/src/Extend/LifecycleInterface.php
new file mode 100644
index 000000000..cbe8a96e4
--- /dev/null
+++ b/framework/core/src/Extend/LifecycleInterface.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Extend;
+
+use Flarum\Extension\Extension;
+use Illuminate\Contracts\Container\Container;
+
+interface LifecycleInterface
+{
+    public function onEnable(Container $container, Extension $extension);
+
+    public function onDisable(Container $container, Extension $extension);
+}
diff --git a/framework/core/src/Extend/Locales.php b/framework/core/src/Extend/Locales.php
index 8b2b83e97..02a3d52a9 100644
--- a/framework/core/src/Extend/Locales.php
+++ b/framework/core/src/Extend/Locales.php
@@ -25,7 +25,7 @@ class Locales implements ExtenderInterface
         $this->directory = $directory;
     }
 
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         /** @var LocaleManager $locales */
         $locales = $container->make(LocaleManager::class);
diff --git a/framework/core/src/Extend/Routes.php b/framework/core/src/Extend/Routes.php
index c84cde797..2d3cc71ab 100644
--- a/framework/core/src/Extend/Routes.php
+++ b/framework/core/src/Extend/Routes.php
@@ -63,7 +63,7 @@ class Routes implements ExtenderInterface
         return $this;
     }
 
-    public function __invoke(Container $container, Extension $extension = null)
+    public function extend(Container $container, Extension $extension = null)
     {
         if (empty($this->routes)) {
             return;
diff --git a/framework/core/src/Extension/Extension.php b/framework/core/src/Extension/Extension.php
index 74038eae8..a85792961 100644
--- a/framework/core/src/Extension/Extension.php
+++ b/framework/core/src/Extension/Extension.php
@@ -12,6 +12,7 @@
 namespace Flarum\Extension;
 
 use Flarum\Extend\Compat;
+use Flarum\Extend\LifecycleInterface;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Support\Arr;
@@ -83,13 +84,6 @@ class Extension implements Arrayable
      */
     protected $version;
 
-    /**
-     * Whether the extension is enabled.
-     *
-     * @var bool
-     */
-    protected $enabled = false;
-
     /**
      * @param       $path
      * @param array $composerJson
@@ -121,7 +115,7 @@ class Extension implements Arrayable
                 $extender = new Compat($extender);
             }
 
-            $extender($app, $this);
+            $extender->extend($app, $this);
         }
     }
 
@@ -223,23 +217,18 @@ class Extension implements Arrayable
         return $icon;
     }
 
-    /**
-     * @param bool $enabled
-     * @return Extension
-     */
-    public function setEnabled($enabled)
+    public function enable(Container $container)
     {
-        $this->enabled = $enabled;
-
-        return $this;
+        foreach ($this->getLifecycleExtenders() as $extender) {
+            $extender->onEnable($container, $this);
+        }
     }
 
-    /**
-     * @return bool
-     */
-    public function isEnabled()
+    public function disable(Container $container)
     {
-        return $this->enabled;
+        foreach ($this->getLifecycleExtenders() as $extender) {
+            $extender->onDisable($container, $this);
+        }
     }
 
     /**
@@ -277,6 +266,19 @@ class Extension implements Arrayable
         return array_flatten($extenders);
     }
 
+    /**
+     * @return LifecycleInterface[]
+     */
+    private function getLifecycleExtenders(): array
+    {
+        return array_filter(
+            $this->getExtenders(),
+            function ($extender) {
+                return $extender instanceof LifecycleInterface;
+            }
+        );
+    }
+
     private function getExtenderFile(): ?string
     {
         $filename = "{$this->path}/extend.php";
diff --git a/framework/core/src/Extension/ExtensionManager.php b/framework/core/src/Extension/ExtensionManager.php
index 6ca5aed90..62e4e0502 100644
--- a/framework/core/src/Extension/ExtensionManager.php
+++ b/framework/core/src/Extension/ExtensionManager.php
@@ -83,7 +83,6 @@ class ExtensionManager
                 // Per default all extensions are installed if they are registered in composer.
                 $extension->setInstalled(true);
                 $extension->setVersion(Arr::get($package, 'version'));
-                $extension->setEnabled($this->isEnabled($extension->getId()));
 
                 $extensions->put($extension->getId(), $extension);
             }
@@ -113,25 +112,27 @@ class ExtensionManager
      */
     public function enable($name)
     {
-        if (! $this->isEnabled($name)) {
-            $extension = $this->getExtension($name);
-
-            $this->dispatcher->dispatch(new Enabling($extension));
-
-            $enabled = $this->getEnabled();
-
-            $enabled[] = $name;
-
-            $this->migrate($extension);
-
-            $this->publishAssets($extension);
-
-            $this->setEnabled($enabled);
-
-            $extension->setEnabled(true);
-
-            $this->dispatcher->dispatch(new Enabled($extension));
+        if ($this->isEnabled($name)) {
+            return;
         }
+
+        $extension = $this->getExtension($name);
+
+        $this->dispatcher->dispatch(new Enabling($extension));
+
+        $enabled = $this->getEnabled();
+
+        $enabled[] = $name;
+
+        $this->migrate($extension);
+
+        $this->publishAssets($extension);
+
+        $this->setEnabled($enabled);
+
+        $extension->enable($this->app);
+
+        $this->dispatcher->dispatch(new Enabled($extension));
     }
 
     /**
@@ -143,19 +144,21 @@ class ExtensionManager
     {
         $enabled = $this->getEnabled();
 
-        if (($k = array_search($name, $enabled)) !== false) {
-            $extension = $this->getExtension($name);
-
-            $this->dispatcher->dispatch(new Disabling($extension));
-
-            unset($enabled[$k]);
-
-            $this->setEnabled($enabled);
-
-            $extension->setEnabled(false);
-
-            $this->dispatcher->dispatch(new Disabled($extension));
+        if (($k = array_search($name, $enabled)) === false) {
+            return;
         }
+
+        $extension = $this->getExtension($name);
+
+        $this->dispatcher->dispatch(new Disabling($extension));
+
+        unset($enabled[$k]);
+
+        $this->setEnabled($enabled);
+
+        $extension->disable($this->app);
+
+        $this->dispatcher->dispatch(new Disabled($extension));
     }
 
     /**
diff --git a/framework/core/src/Formatter/FormatterServiceProvider.php b/framework/core/src/Formatter/FormatterServiceProvider.php
index 25de9fe55..8ed73457b 100644
--- a/framework/core/src/Formatter/FormatterServiceProvider.php
+++ b/framework/core/src/Formatter/FormatterServiceProvider.php
@@ -11,23 +11,11 @@
 
 namespace Flarum\Formatter;
 
-use Flarum\Extension\Event\Disabled;
-use Flarum\Extension\Event\Enabled;
 use Flarum\Foundation\AbstractServiceProvider;
 use Illuminate\Contracts\Container\Container;
-use Illuminate\Contracts\Events\Dispatcher;
 
 class FormatterServiceProvider extends AbstractServiceProvider
 {
-    /**
-     * {@inheritdoc}
-     */
-    public function boot(Dispatcher $events)
-    {
-        $events->listen(Enabled::class, [$this, 'flushFormatter']);
-        $events->listen(Disabled::class, [$this, 'flushFormatter']);
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -43,9 +31,4 @@ class FormatterServiceProvider extends AbstractServiceProvider
 
         $this->app->alias('flarum.formatter', Formatter::class);
     }
-
-    public function flushFormatter()
-    {
-        $this->app->make('flarum.formatter')->flush();
-    }
 }
diff --git a/framework/core/src/Foundation/InstalledSite.php b/framework/core/src/Foundation/InstalledSite.php
index 3aa8ca415..2362fa11f 100644
--- a/framework/core/src/Foundation/InstalledSite.php
+++ b/framework/core/src/Foundation/InstalledSite.php
@@ -173,7 +173,7 @@ class InstalledSite implements SiteInterface
         $laravel->boot();
 
         foreach ($this->extenders as $extension) {
-            $extension($laravel);
+            $extension->extend($laravel);
         }
 
         return $laravel;