Hi, If i open a fresh copy of Firefox with no add-ons , then i visit sites like youtube or vimeo i notice that HD videos playback is very choppy , but if i install a Firefox extension which is not compatible with e10s, i can play on the browser 720p and 1080p videos without problems, by the way i'm using Firefox 56 , but i tried also Firefox 57 beta , then Firefox 58 nightly , and i realized the problem is still there, so what's wrong with e10s ?

I would like to add that: - I did not change firefox default settings which enable the gpu acceleration by default . -I have no gpu acceleration problems with video players like Potplayer or VLC . -Updating the video card driver wasn't useful. -My OS is Windows 7 sp 1 (32bit).