Firefox loads, icon is on task bar but when clicked the graphics slide off to the right but don't fill the screen & when clicked again, falls back into the icon

Firefox, Thunderbird & Quicken were active when I loadad & ran a slot machine game. When I exited the game & clicked the icon to return Firefox to full screen, I could see the image flash off to the right side of my monitor screen and disappear. When I again clicked on the icon in the task bar, the reverse happened- the image flashed from the right down to the icon. When I hover the mouse pointer over the icon, the open screens show up with the red X to close but the same thing happens when I click on that box. The other two programs that were open while the game was active are working fine, only Firefox has been affected. I cannot open the program to access any of the menu items as I cannot get the screen image on the monitor. I did uninstall the program and reinstall a freshly downloaded copy I had to use IE, as I am now) but with the same results when I run it. I did chose to save my settings so if something has been changed there then that might be the problem.

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Once you get the pop-up, just select "'Start in Safe Mode"''
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

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