Firefox showing a different language/characters?
A few weeks I started having a issue where some websites show text/characters other than English. It's not all websites or even the full page and if i copy and paste the text into a text editor it shows up as English.
Wikipedia for example
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This can be caused by corrupted font that Firefox replaces by another font.
You can check in Font Book for font issues like corrupted and duplicate fonts.
You can right-click and select "Inspect Element" to open the builtin 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 Font 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.