antyaliasing - How to disable font smoothing
How to disable font smoothing (antyaliasing) in mozilla?
How to disable font smoothing (antyaliasing) in mozilla?
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That old method of completely disabling hardware acceleration may adversely impact videos and maps, so I suggest saving that as a last resort.
I've experimented with settings for Windows in past threads, but I somehow doubt that "ClearType" preferences even exist on Linux (or if they do, would they have any effect?). Still, you could take a look: https://support.mozilla.org/questions/1120385#answer-870910