Fonts not showing
Fonts not showing in G Mail and some sites. Mac os 10.15.7 Started after I refreshed browser.
Wšykne wótegrona (1)
This can be caused by a corrupted font or by a font that can't be loaded, so you need to find out what font this is about in your case.
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.