diff --git a/basics_user/user-faq.md b/basics_user/user-faq.md
index 0553a919..56b61b60 100644
--- a/basics_user/user-faq.md
+++ b/basics_user/user-faq.md
@@ -57,6 +57,7 @@ Qubes Users' FAQ
  * [How do I play video files?](#how-do-i-play-video-files)
  * [My encrypted drive doesn't appear in Debian qube?](#my-encrypted-drive-doesnt-appear-in-debian-qube)
  * [Windows Update is stuck.](#windows-update-is-stuck)
+ * [Fullscreen Firefox is frozen.](#fullscreen-firefox-is-frozen)
   
 -----------------
 
@@ -399,3 +400,7 @@ The decrypted device is now available at `/mnt` - when you have finished using i
 This has nothing to do with Qubes. 
 [It's a longstanding Windows bug.](https://superuser.com/questions/951960/windows-7-sp1-windows-update-stuck-checking-for-updates)
 
+### Fullscreen Firefox is frozen.
+
+Press `F11` twice.
+