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I pressed something, and it made the browser go into a "full screen" mode, how do I change it back? And also, something happened and made my FireFox text on all internet pages smaller, is there any way I could change this setting?

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I had pressed a button on my keyboard which made my text and pictures and the whole page smaller in size, can I change that? And how could I change my browser out of "Full Screen" mode?

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You can press F10 to toggle (View) Full Screen mode.

Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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F11 controls full screen mode in W7... But, I to have the small font display that I can cure (as long as I stay on one page), - Ctrl +. But, as soon as I page, screen goes back to small font??? Annoying!!!

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The Firefox Page Zoom feature does a domain by domain level of saving the users preferred zoom level settings, there is no default Page Zoom level setting in Firefox.

Try the Default FullZoom Level extension:

Or the NoSquint extension: