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fonts won't display on certain websites

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I have tried changing the font preferences in Firefox every which way but certain sites (I'm looking at you CVS) only display question marks not fonts.

I have tried changing the font preferences in Firefox every which way but certain sites (I'm looking at you CVS) only display question marks not fonts.

Ọ̀nà àbáyọ tí a yàn

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" 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.

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Ọ̀nà àbáyọ Tí a Yàn

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" 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.

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Seems to be fixed by using Font Cleaner on my Mac. Thank you!