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Gibberish instead of text on a number of sites. Using macOS

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I get gibberish instead of text on a number of sites (Dqwt icpv'J gcxgp"J). Using macOS.

I get gibberish instead of text on a number of sites (Dqwt icpv'J gcxgp"J). Using macOS.
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We have seen reports that this can be caused by a problem with fonts like Helvetica that you have installed locally and that might be corrupted or are missing variants. You will have to identify and remove corrupted font(s).

You can right-click and select "Inspect Element" 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 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.