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Most text is not displaying, even when selected.
Pretty much all sites' text don't work. I think it might be to do with using custom fonts that aren't installed on my PC.
Todas as respostas (2)
Update: It's not as simple as I thought it may be with the fonts as some sites using default fonts don't work either. I've attached two examples, one disproving my prior thoughts, since I couldn't before.
Did you check in the Fonts tab in the right panel of the Inspector to see what font(s) this is about?
You can check the font used for selected text in the Font tab in the right pane of the Inspector. Note that this is not about the font-family CSS rule, but about the font that Firefox actually uses as shown in the Font tab.