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Problem: When playing videos on the YouTube site in Firefox, the video flickers a lot, switching between a small size to the normal size.
Workaround, based on a websearch: Add "&fmt", without the quotes, to the end of the URL, and reload the page. This may show the video in a lower quality, but without the flicker.
Alternately, use "&fmt=6", "&fmt=8", or "&fmt=18", but there may be other issues with those.
Another workaround is to simply position the cursor over the volume button - this does not get rid of all the flicker, but it reduces the amount of it. (Yep, weird).
Workaround, based on a websearch: Add "&fmt", without the quotes, to the end of the URL, and reload the page. This may show the video in a lower quality, but without the flicker.
Alternately, use "&fmt=6", "&fmt=8", or "&fmt=18", but there may be other issues with those.
Another workaround is to simply position the cursor over the volume button - this does not get rid of all the flicker, but it reduces the amount of it. (Yep, weird).