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It only happens with Stack Overflow, so I think it's probably a certain key combination or something I did with the mouse without noticing.

How can I undo this?

Firefox 3.5.3

Ubuntu 8.0.4

alt text

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In Firefox under windows (so may not apply to Ubuntu), Ctrl 0 will reset the size to standard. Do it once and it should stay that way. Any good?

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same function via menus: View -> Zoom -> Reset – quack quixote Nov 18 '09 at 8:11
you saved my day – flybywire Nov 18 '09 at 8:29

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