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When I open firefox, my display and fonts are huge. How do I fix that?

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My display opens correctly when I log in, but my Firebox window displays very large fonts that uses the entire screen.

My display opens correctly when I log in, but my Firebox window displays very large fonts that uses the entire screen.

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Check your zoom settings.

<Control> + (plus) increase <Control> - (minus) reduce <Control> 0 (zero) reset

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Can you attach a screenshot?

Use a compressed image type like PNG or JPG to save the screenshot.