I have a problem here with playback of FB videos. It is specific only for that original FB videos, not for YT videos or etc. The problem is when i start playing video, everything is OK but when i try to switch video to specific playback time, it totally stops and is unresponsive to any attempt, it looks like video is paused and as i've said, when i try to click on it to play, no response. I can only to click on any playback time in video and it shows "picture" from video in that playback time. It is like when you pause the video and then you can click on any playback time and it shows what is in that video time but without playing video. So when I want to see any video, I have to see it all without any switching of playback time, otherwise it totally "pause" the video. It occured during this last FF version of 53, some weeks ago. I've tried to stop plugins, also clear cache?
I didn't find the right solution from the Internet.