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I use Firefox on Ubuntu and do not have this issue - is there something more specific that triggers this behavior? Have a link to the bug tracker?

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No clue to be honest, I just opened it on a single tab of Reddit and it was using high single to double digits of CPU sitting there.

I looked at the bug again with fresh eyes and it seems like there is a deeper issue that may be my fault.

I am running i3-wm and it seems like Firefox gets stuck in a loop if you don't have all the fonts it expects. I had a previous issue where I was crashing my terminal when a program tried to show emojis, which was a legitimately a fun issue to figure out.

https://bugzilla.mozilla.org/show_bug.cgi?id=1495900

https://bugzilla.mozilla.org/show_bug.cgi?id=1499385 (not sure if this was the one I saw before giving up + installing Brave, but the fact there are _tons_ of "Firefox hitting 100% cpu" is telling)

Aha, that is something to watch out for, and may explain what I've seen on some websites!

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