Edit/update: I logged out, moved several files out of .config, restarted Plasma, and fonts are normal again.

I recently deleted some fonts (Arimo and Cousine). The next time I started Firefox, the UI fonts were blocky and generally bad.

I went to System Settings > Fonts, saw that Anti-Aliasing was still enabled, but that the "Exclude range from anti-aliasing" was checked (wasn't before) and the exclude range was 0 -99.

I unchecked the Exclude range, applied, restarted Firefox and things looked good. However after the next Plasma restart, the Exclude range option was checked again, and again set to range of 0 - 99.

I've tried changing the Exclude range to 0 - 8 and other values, but 0 - 99 keeps coming back after I logout then restart Plasma.

I found this bug report about not tracking Exclude range properly, https://www.mail-archive.com/kde-bugs-d ... 62977.html, but it is marked fixed in 5.16.1, and I am running 5.16.3.

I can't find any files in .config that seem to control the Exclude range being on or off or the range of values.