--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -4699,18 +4699,23 @@ pref("full-screen-api.enabled", false);
 #ifdef RELEASE_BUILD
 pref("full-screen-api.unprefix.enabled", false);
 #else
 pref("full-screen-api.unprefix.enabled", true);
 #endif
 pref("full-screen-api.allow-trusted-requests-only", true);
 pref("full-screen-api.pointer-lock.enabled", true);
 // transition duration of fade-to-black and fade-from-black, unit: ms
+#ifndef MOZ_WIDGET_GTK
 pref("full-screen-api.transition-duration.enter", "200 200");
 pref("full-screen-api.transition-duration.leave", "200 200");
+#else
+pref("full-screen-api.transition-duration.enter", "0 0");
+pref("full-screen-api.transition-duration.leave", "0 0");
+#endif
 // timeout for black screen in fullscreen transition, unit: ms
 pref("full-screen-api.transition.timeout", 1000);
 // time for the warning box stays on the screen before sliding out, unit: ms
 pref("full-screen-api.warning.timeout", 3000);
 // delay for the warning box to show when pointer stays on the top, unit: ms
 pref("full-screen-api.warning.delay", 500);
 
 // DOM pointerlock API