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An unintended keystroke combination reduced the display to 2/3 of the screen (NOT F11) leaving the right-hand side black in only one tab (other tabs are ok).

Firefox Tips and tricks
user633449 replied
arnesson
arnesson

Windows 7, Firefox 17.0

Solved! Thanks Tyler

Windows 7, Firefox 17.0 Solved! Thanks Tyler

Modified by arnesson

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user633449
user633449

Chosen Solution

Font size and zoom - increase the size of web pages try to reset the zoom to 100%