See instructions here on how to re-enable the Firefox hardware acceleration setting.
Firefox's performance settings
https://support.mozilla.org/en-US/kb/performance-settings?as=u&utm_source=inproduct
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One day I was messing around with overclocking my gpu, and it was unstable and my display was all buggy, so I went to revert it. My browser happened to be open at the time, and while I was reconnecting my gpu to sort of reset it, Windows popped up a notification that it had disabled hardware acceleration for Firefox due to the instability. I tried to click on this notification and I got nothing, and when I looked into my old notifications, it was gone, I could not get any more information about this decision that my system had made. Now my browser has hardware acceleration permanently disabled and I have no way of changing it, I tried going into the settings in Display Settings -> Graphics Settings and setting it there, but it doesn't work. The browser remains at 0% gpu utilization while another browser I had uses as much as it needs for videos and stuff.
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See instructions here on how to re-enable the Firefox hardware acceleration setting.
Firefox's performance settings
https://support.mozilla.org/en-US/kb/performance-settings?as=u&utm_source=inproduct