diff --git a/src/Controller/ExtensionController.php b/src/Controller/ExtensionController.php
new file mode 100644
index 000000000..1bfd99b2d
--- /dev/null
+++ b/src/Controller/ExtensionController.php
@@ -0,0 +1,75 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of Packagist.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *     Nils Adermann <naderman@naderman.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use App\Entity\Package;
+use App\Model\DownloadManager;
+use App\Model\FavoriteManager;
+use Pagerfanta\Adapter\FixedAdapter;
+use Pagerfanta\Pagerfanta;
+use Predis\Client as RedisClient;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\EventListener\AbstractSessionListener;
+use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+class ExtensionController extends Controller
+{
+    #[Route(path: '/extensions.{_format}', name: 'browse_extensions', defaults: ['_format' => 'html'])]
+    public function extensionsAction(Request $req, RedisClient $redis, FavoriteManager $favMgr, DownloadManager $dlMgr): Response
+    {
+        $packages = $this->getEM()->getRepository(Package::class)
+            ->createQueryBuilder('p')
+            ->where("(p.type = 'php-ext' OR p.type = 'php-ext-zend')")
+            ->andWhere('p.frozen IS NULL')
+            ->orderBy('p.name')
+            ->getQuery()
+            ->enableResultCache(900)
+            ->getResult();
+
+        $packages = new Pagerfanta(new FixedAdapter(count($packages), $packages));
+
+        $data = [
+            'packages' => $packages,
+        ];
+        $data['meta'] = $this->getPackagesMetadata($favMgr, $dlMgr, $data['packages']);
+
+        if ($req->getRequestFormat() === 'json') {
+            $result = [
+                'packages' => [],
+            ];
+
+            foreach ($packages as $package) {
+                $url = $this->generateUrl('view_package', ['name' => $package->getName()], UrlGeneratorInterface::ABSOLUTE_URL);
+
+                $result['packages'][] = [
+                    'name' => $package->getName(),
+                    'description' => $package->getDescription() ?: '',
+                    'url' => $url,
+                    'downloads' => $data['meta']['downloads'][$package->getId()],
+                    'favers' => $data['meta']['favers'][$package->getId()],
+                ];
+            }
+
+            $response = new JsonResponse($result);
+            $response->setSharedMaxAge(900);
+            $response->headers->set(AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER, 'true');
+
+            return $response;
+        }
+
+        return $this->render('extensions/list.html.twig', $data);
+    }
+}
diff --git a/src/Entity/Package.php b/src/Entity/Package.php
index 40145e54c..b8464e346 100644
--- a/src/Entity/Package.php
+++ b/src/Entity/Package.php
@@ -76,6 +76,7 @@ public function isRemoteIdMismatch(): bool
 #[ORM\Index(name: 'dumped2_crawled_frozen_idx', columns: ['dumpedAtV2', 'crawledAt', 'frozen'])]
 #[ORM\Index(name: 'vendor_idx', columns: ['vendor'])]
 #[ORM\Index(name: 'frozen_idx', columns: ['frozen'])]
+#[ORM\Index(name: 'type_frozen_idx', columns: ['type', 'frozen'])]
 #[UniquePackage(groups: ['Create'])]
 #[VendorWritable(groups: ['Create'])]
 #[ValidPackageRepository(groups: ['Update', 'Default'])]
diff --git a/templates/extensions/list.html.twig b/templates/extensions/list.html.twig
new file mode 100644
index 000000000..50e2cd2be
--- /dev/null
+++ b/templates/extensions/list.html.twig
@@ -0,0 +1,5 @@
+{% embed "web/list.html.twig" %}
+    {% block content_title %}
+        <h2 class="title">PHP Extensions</h2>
+    {% endblock %}
+{% endembed %}