diff --git a/machines/models.py b/machines/models.py
index c6275bb8..4f359477 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -981,6 +981,32 @@ class Extension(RevMixin, AclMixin, models.Model):
             ("machines.use_all_extension",),
         )
 
+    @classmethod
+    def can_list(cls, user_request, *_args, **_kwargs):
+        """All users can list unprivileged extensions 
+        Only members of privileged groups can list all.
+
+        :param user_request: The user who wants to view the list.
+        :return: True if the user can view the list and an explanation
+            message.
+
+        """
+        can, _message, _group = cls.can_use_all(user_request)
+        if can:
+            return (
+                True,
+                None,
+                None,
+                cls.objects.all()
+            )
+        else:
+            return (
+                False,
+                _("You don't have the right to list all extensions."),
+                ("machines.use_all_extension",),
+                cls.objects.filter(need_infra=False),
+            )
+
     def __str__(self):
         return self.name