Cyrilic encoding on ru.wikipedia.org
All the articles headings on ru.wikipedia.org have wrong encoding but the main text looks good.
I tried disabling "Allow pages to choose their own fonts" in the FF setting but I couldn't match the fonts using my systems ones so pages in Russian language don't look weirdly formatted.
Any suggestion how to fix it?
Firefox 108.0.2, MacOS 11.7.2
Chosen solution
This is usually caused by a problem with a specific font and you need to identify this font and fix this.
You can check in Font Book for font issues like corrupted and duplicate fonts. Note that you shouldn't disable "Allow pages to choose their own fonts, instead of your selections above" as this will cause issues with iconic fonts used by webpages to display small icons (you may see text labels instead of icons).
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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Chosen Solution
This is usually caused by a problem with a specific font and you need to identify this font and fix this.
You can check in Font Book for font issues like corrupted and duplicate fonts. Note that you shouldn't disable "Allow pages to choose their own fonts, instead of your selections above" as this will cause issues with iconic fonts used by webpages to display small icons (you may see text labels instead of icons).
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.
@cor-el Thank you so much for the help! Indeed, Georgia font family is used for heading. And it turned out I had duplicates in Font Book.