Twitter video/gifs showing as black screen (audio works fine)
Only on Firefox (not Chrome, for example) animated gifs and videos on Twitter will not display -- they instead show a black screen. When paused or not yet played, there is a visible image, but as soon as I press play, it goes to black. The audio on a video will play just fine, but the screen/image is still black.
I have checked my graphics drivers for updates and they are all up-to-date. Also the gifs/videos play just fine if I use Chrome.
Firefox is up to date. I'm on v 93.0 (64-bit).
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Note that the animated GIFs also are short MP4 videos. You can check the Web Console for media related messages.
The red lines that came up include:
Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”). moz-extension:35:9 Content Security Policy: The page’s settings blocked the loading of a resource at data: (“media-src”). Content Security Policy: The page’s settings blocked the loading of a resource at data:i (“object-src”).
What now?