There's a lemmy bug on this (or something closely related): https://github.com/LemmyNet/lemmy-ui/issues/1385
this post was submitted on 21 Jun 2023
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Firefox 114.0.2 is available now and after updating the issue is gone.
I also noticed this last night on Pop! OS. Noticed it nearing max- with 32gb of RAM, when my system fans spun up out of the blue. Closing my tab released all the memory. Does not appear to affect the machine I'm using currently though, which is odd- Linux Mint, same Firefox version.