diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 9e024d75f365..252ccacfabd5 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -384,6 +384,7 @@ pref("media.navigator.load_adapt.low_load","0.40");
 pref("media.navigator.video.default_fps",30);
 pref("media.navigator.video.default_minfps",10);
 pref("media.navigator.video.use_remb", true);
+pref("media.navigator.video.use_tmmbr", true);
 
 
 pref("media.webrtc.debug.trace_mask", 0);