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Why does Firefox insist on pausing videos when they're not the active window?

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Okay, so say I have a Twitch/YouTube/DailyMotion/whatevervideosite up on one display in a Firefox window, and I'm doing some regular browsing in another window on a second display. When I do anything in that second window, any and all video playback will stop, although the audio will continue. As soon as I move my mouse cursor over to the window with the video, the video jumps back to life, skips itself to catch up to the audio, and continues on until I choose to do something in the first window again. Essentially, if I now want to watch a stream or uploaded video, I cannot do anything else with my browser until the video is done. This wasn't happening until 55.0.3, and it seems that even a rollback isn't fixing it (so its buggered something in my registry as well presumably). Any help would be appreciated, because as it stands, I can say goodbye to my off-hours hobby of streaming.

Okay, so say I have a Twitch/YouTube/DailyMotion/whatevervideosite up on one display in a Firefox window, and I'm doing some regular browsing in another window on a second display. When I do anything in that second window, any and all video playback will stop, although the audio will continue. As soon as I move my mouse cursor over to the window with the video, the video jumps back to life, skips itself to catch up to the audio, and continues on until I choose to do something in the first window again. Essentially, if I now want to watch a stream or uploaded video, I cannot do anything else with my browser until the video is done. This wasn't happening until 55.0.3, and it seems that even a rollback isn't fixing it (so its buggered something in my registry as well presumably). Any help would be appreciated, because as it stands, I can say goodbye to my off-hours hobby of streaming.

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Does this problem affect all video sites or only certain ones? Does it affect any other browsers you use with the same sites?

I can't replicate this problem on a single monitor (by playing a YouTube video in a separate inactive window next to my active window). Maybe this a multi-monitor issue?? (Also, my add-ons disable multiprocess, so that might be a factor.)