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system and toolbox default fonts rest

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all toolbox default font and system font of firefox has been changed to some unknown font style which cannot be readable properly. sought help to set default font style and size

all toolbox default font and system font of firefox has been changed to some unknown font style which cannot be readable properly. sought help to set default font style and size

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You may have a corrupted or missing system (core) font that you need to reinstall.

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