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Why have most fonts shown as Dom Casual? And why can't I change it?

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A lot of the time, the fonts on websites are changed to, what looks like, Dom Casual. This is not the original font used on these sites. And, it's small and very unreadable. Even in Yahoo Mail, text shows as Dom and I can't change it. How do I keep these fonts as they should be seen?

A lot of the time, the fonts on websites are changed to, what looks like, Dom Casual. This is not the original font used on these sites. And, it's small and very unreadable. Even in Yahoo Mail, text shows as Dom and I can't change it. How do I keep these fonts as they should be seen?

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You can do a check for corrupted and duplicate fonts and other font issues:

You can do a font test to see if you can identify corrupted font(s).

You can also try different default fonts.

  • Firefox > Preferences > Content : Fonts & Colors > Advanced