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Firefox crashes when playing video

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I was watching a Youtube video when suddenly the browser stuttered visually and crashed. Now the program will exhibit the same behavior starting a webm or youtube video immediately. No changes were made before this, though I have tried the workaround to turn off media.wmf.vp9.enabled and that did not fix the issue.

I was watching a Youtube video when suddenly the browser stuttered visually and crashed. Now the program will exhibit the same behavior starting a webm or youtube video immediately. No changes were made before this, though I have tried the workaround to turn off media.wmf.vp9.enabled and that did not fix the issue.

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Did you try to close and restart Firefox or reboot the computer ?