This has happened before, on different Macs, after upgrading from 80.x versions to 90.x versions. A portion of the text starts displaying in what I assume is some foreign font. I got it solved somehow, on one machine, but of course I don't remember what worked. I've been futzing now for at least an hour, cleaning font caches via Font Explorer X, etc. Nothing has worked. I am assuming some font is missing that it needs, but what is it? How do I find out?

This is an older system that I just booted after a drive upgrade (cloned). Firefox was on version 82,x and displayed perfectly. Then I made the mistake of upgrade to the current version, and got this font mess.

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Check cookies for a Google Fonts API entry. Don't remember the exact
name but it is not required and may be contributing to the weirdness.

Did you check [about:preferences#general - Fonts and Colors] ?

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Edited 1 time(s). Last edit at 12/01/2021 08:50PM by MrNoBody.

No confidence at all in Font Explorer's cache-cleaning.

Try a safe-boot.

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What happens if you log in with a new user account?

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Quote
MrNoBody
Check cookies for a Google Fonts API entry. Don't remember the exact
name but it is not required and may be contributing to the weirdness.

Did you check [about:preferences#general - Fonts and Colors] ?

Yeah, checked the General preferences. Of course most of it is in the mystery font, but the relevant stuff is correct. I'll check the cookies next time I boot up that Mini.

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My life goes smoothly and in regular intervals

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Sarcany
No confidence at all in Font Explorer's cache-cleaning.

Try a safe-boot.

Good idea, I will try that next time I use that Mini.

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My life goes smoothly and in regular intervals

Quote
Sarcany
No confidence at all in Font Explorer's cache-cleaning.

Try a safe-boot.

Still no joy. Firefox continues to be gibberish. Really frustrating, since versions before 90.x did not exhibit this problem.

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My life goes smoothly and in regular intervals