
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
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%