Use Firefox's Safe Mode
Sometimes add-ons for Firefox (extensions or themes) can cause problems. Safe Mode runs Firefox with your add-ons disabled. Follow these steps to start Safe Mode:
Make sure Firefox is closed (open the "File" menu, then select "Exit")
Click the Start button, open the All Programs list, and navigate to the Mozilla Firefox folder. Select "Mozilla Firefox (Safe Mode)".
When the Safe Mode dialog box appears, click "Continue in Safe Mode"
If the problem does not occur in Safe Mode, and extension or theme is likely the cause. Read the Troubleshooting Extensions and Themes article on the Firefox Support website for more information.
Reset Firefox Preferences
Close down Firefox completely (open the "File" menu, then select "Exit")
Click the Start button, open the All Programs list, and navigate to the Mozilla Firefox folder. Select "Mozilla Firefox (Safe Mode)".
When the Safe Mode dialog box appears, put a check mark by "Reset all user preferences to Firefox defaults" and "Reset toolbars and controls"
Click "Make Changes and Restart"
Troubleshoot Plugins
Open the Add-ons Window by clicking the "Tools" menu and selecting "Add-ons"
Click on the Plugins icon at the top of the Add-ons window
Disable each plugin one-by-one until the problem goes away. You do not have to restart Firefox each time.
If you encounter a plugin that is causing problems, you may need to update or reinstall it. If the problem continues, you can leave the plugin disabled.
Create a New Profile
Start the Profile Manager
Create a new profile
Select the newly created profile and click "Start Firefox"
If the problem goes away, you can recover your important data. To avoid recreating the problem, only recover important files such as your bookmarks and saved passwords.
Reinstall Firefox
Make sure Firefox is closed (open the "File" menu, then select "Exit")
Download the latest version of Firefox from mozilla.com
Back up your important data if you wish to do so
Uninstall Firefox using the Add/Remove Programs utility in the Windows Control Panel
Delete the "Mozilla Firefox" folder located in the Windows "Program Files" folder
Delete the Firefox profile folder
Run the Firefox installation program
When Firefox is started for the first time, the "Import Settings and Data" wizard will appear and a new profile will be created
Recover your important data if you chose to do so
Reinstall your extensions and themes
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