Some pages are displaying partially in another language
Firefox is displaying some pages and parts of pages in another language. The language settings are correct--English--and most pages are displaying properly, but some (including facebook.com, instagram.com, the default Mozilla homepage, and some Mozilla dialogue boxes) are not. Thank you so much for any help you can give!!
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This is usually a problem with a font and you need you find out what font this is about and fix or remove this font.
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.
These days a lot of websites use an iconic font to display small images. If you would disable website fonts via "Allow pages to choose their own fonts, instead of my selections above" then such fonts are disabled and you may see little boxes with the hex code of the character or text labels instead.