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).
Windows 7, Firefox 17.0
Solved! Thanks Tyler
Windows 7, Firefox 17.0
Solved! Thanks Tyler
Modified
Chosen solution
Font size and zoom - increase the size of web pages try to reset the zoom to 100%
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Chosen Solution
Font size and zoom - increase the size of web pages try to reset the zoom to 100%