diff --git a/modules/firefox.nix b/modules/firefox.nix
index 962f53e..592010b 100644
--- a/modules/firefox.nix
+++ b/modules/firefox.nix
@@ -103,5 +103,6 @@
   programs.firefox.autoConfig = ''
     lockPref("sidebar.revamp", true);
     lockPref("sidebar.verticalTabs", true);
+    lockPref("media.videocontrols.picture-in-picture.enable-when-switching-tabs.enabled", true);
   '';
 }