Let browsers decide when to remvoe session cookies

extend.php

@@ -8,10 +8,12 @@
  */
 
 use App\Console\EnableExtensions;
+use App\ServiceProvider\SessionServiceProvider;
 use App\ServiceProvider\SyslogServiceProvider;
 use Flarum\Extend;
 
 return [
     (new Extend\Console())->command(EnableExtensions::class),
     (new Extend\ServiceProvider())->register(SyslogServiceProvider::class),
+    (new Extend\ServiceProvider())->register(SessionServiceProvider::class),
 ];

src/ServiceProvider/SessionServiceProvider.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\ServiceProvider;
+
+use Flarum\Foundation\AbstractServiceProvider;
+use Illuminate\Contracts\Config\Repository;
+
+class SessionServiceProvider extends AbstractServiceProvider
+{
+    public function register()
+    {
+        /** @var Repository $config */
+        $config = $this->container->get('config');
+        $config->set('session.lifetime');
+    }
+}