Works fine but like Firefox user 12726217 said its now giving "Playback isn't supported on this device." errors or nothing at all(just a black area that you cant interact with), but it seem to mainly be on embedded videos, sometimes video works after several refreshes, but like 90% of the time it gives the playback error or its just a black area. Disabling the addon makes videos load with no issues.
Edit: Works fine after new Update