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Cant read or view anything on Firefox screen.

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I downloaded Firefox on my Vista Home Premium 32 bit desktop computer yesterday. The screen was too large and the font was too large, so...I put about:config in the address box and then clicked on layout.css.devPixelsPerPx. Then I typed in 2.0. The text got so small I cannot reead anything on mozilla. i am typing this question now and can't see what I am typing. Can someone help me? I hope the answer goes to my email box because I can't see it in mozilla. Help

I downloaded Firefox on my Vista Home Premium 32 bit desktop computer yesterday. The screen was too large and the font was too large, so...I put about:config in the address box and then clicked on layout.css.devPixelsPerPx. Then I typed in 2.0. The text got so small I cannot reead anything on mozilla. i am typing this question now and can't see what I am typing. Can someone help me? I hope the answer goes to my email box because I can't see it in mozilla. Help

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Looks like your question duplicated, so let's continue here: https://support.mozilla.org/questions/1110157