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How do I enlarge text without going out of screen boundaries

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I am a senior citizen and need text that is at least size 18 often when I enlarge it to size 18 it extends beyond the margins and I can't read it without scrolling back and forth. Is there a remedy?

I am a senior citizen and need text that is at least size 18 often when I enlarge it to size 18 it extends beyond the margins and I can't read it without scrolling back and forth. Is there a remedy?

All Replies (2)

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Try using the NoSquint add-on to adjust the zoom levels for text.

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I don't know about Mac's, but on Windows versions of Firefox there is a Zoom Text Only option in the View menu.
View > Zoom > Zoom Text Only