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Videos (e.g: Vimeo) show only black screen but with sound only but youtube works fine on firefox (chrome and stockbrowser play them normally), help?

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Hello, On Firefox for Android on my Samsung Galaxy Note 3 whenever i try to stream a video on any site besides youtube (e.g.:Vimeo, Dailymotion, twitch) only audio plays on a black screen.

I used to stock android browser and chrome and on these browsers the video stream normally. Its really only on firefox that i have this problem.

I really prefer firefox over the others (especially coz of adblock) so help would be appreciated.

Thanks in advance

Hello, On Firefox for Android on my Samsung Galaxy Note 3 whenever i try to stream a video on any site besides youtube (e.g.:Vimeo, Dailymotion, twitch) only audio plays on a black screen. I used to stock android browser and chrome and on these browsers the video stream normally. Its really only on firefox that i have this problem. I really prefer firefox over the others (especially coz of adblock) so help would be appreciated. Thanks in advance

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I also encounter this issue. The workaround is to refresh the page then cancel it to stop the video from loading, then, reload it for the second time. I think that this issue is coming from the OpenH264 addon.