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This problem occurs for tabs font as well as font in Library manager:

enter image description here

Can you test and confirm it? Is there any solution? Can I force enable sub-pixel rendering?

Things I tried before:

  1. disabling Fingerprinting.

  2. changing these settings below in about:config:

    gfx.font_rendering.cleartype_params.rendering_mode

    gfx.font_rendering.cleartype_params.force_gdi_classic_for_families

    gfx.font_rendering.cleartype_params.force_gdi_classic_max_size

    gfx.font_rendering.directwrite.use_gdi_table_loading

    gfx.webrender.force-disabled

  3. going into Troubleshoot Mode.

It has been reported before:

https://bugzilla.mozilla.org/show_bug.cgi?id=1707465

Update: I found that disabling mask-image in tabs fixed tabs font, here's what I used in userchrome.css:

/* delete tab text fading / gradient effect (also fix lcd Subpixel rendering)*/
.tab-label-container[textoverflow]:not([pinned]) {mask-image: unset !important;}
amymor
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1 Answers1

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This is a known issue since Firefox 90: https://bugzilla.mozilla.org/show_bug.cgi?id=1724057

ValdikSS
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