Seems like anti-aliasing gone very awry
The oddness is occurring on both my Linux and Windows machines. I think something was added/changed and is syncing back and forth. LMK what you would like from me to troubleshoot this.
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See whether it happens in safe mode: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode A likely culprit is hardware acceleration so try switching that off (beginning with the only setting under 'Performance' on the 'General' page in Options).