diff --git a/prefs/firefox/fullscreen.yaml b/prefs/firefox/fullscreen.yaml
deleted file mode 100644
index 269f46209..000000000
--- a/prefs/firefox/fullscreen.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-# Fullscreen API preferences
-- name: full-screen-api.transition-duration.enter
-  value: "0 0"
-
-- name: full-screen-api.transition-duration.leave
-  value: "0 0"
-
-- name: full-screen-api.warning.delay
-  value: -1
-
-- name: full-screen-api.warning.timeout
-  value: 0