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Firefox shows gibberish text on certain pages

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After I updated my ff browser to the current version, certain websites have had their text all messed up. I first tried restarting the browser and then my computer. Next I tried to purge all cookies. I then tried to remove all add-ons and then purged cookies again, but the issue still persisted.

Firefox version: 105.0.1 (64bit)

OS: Mac Big Sur 11.6

Any ideas on why this is happening or how to fix?

After I updated my ff browser to the current version, certain websites have had their text all messed up. I first tried restarting the browser and then my computer. Next I tried to purge all cookies. I then tried to remove all add-ons and then purged cookies again, but the issue still persisted. Firefox version: 105.0.1 (64bit) OS: Mac Big Sur 11.6 Any ideas on why this is happening or how to fix?
Attached screenshots

All Replies (2)

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You can check in Font Book for font issues like corrupted and duplicate fonts.

You can right-click and select "Inspect" to open the built-in Inspector with this element selected.

You can check in the Rules tab in the right panel in the Inspector what font-family is used for selected text. You can check in the Fonts tab in the right panel in the Inspector what font is actually used because Firefox might be using a different font than specified by the website.

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Deleting the Font Book duplicates fixed this, thank you!

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