I just switched from Ubuntu 23.10 to Debian 12 (using X11) if that helps. I didn’t have this problem in Ubuntu.
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Are you using Firefox within a flatpak perchance ?
There seems to be a bug to it relating to use of bitmap fonts, you can fix the issue by disabling them via a config file in firefox’s fonts: https://bugzilla.mozilla.org/show_bug.cgi?id=1621915