1. Reboot. First restart your computer and see if the browser will work after rebooting.
2. Check for malware. Update your antispyware and antivirus software and do complete antivirus and spyware checks on your PC. If malware is found, remove it and then try to start Firefox.
3. Try starting in Safe Mode. From the Start/ All Programs (or Programs)/ Mozilla Firefox menu, select Mozilla Firefox (Safe Mode). If you can get Firefox running in Safe Mode, try steps 4 and 5 under the “Problem: A page does not behave correctly . . .” section if that doesn’t help, continue with step 4.
4. Clear all cached data. Click the Start button and select My Computer. Go to the folder C:\Documents and Settings\[Your Username]\Local Settings\Application Data\Mozilla\Firefox\ Profiles. Under each folder in Profiles, delete the Cache folder. Then go to C:\Documents and Settings\[Your Username]\ Application Data\Mozilla\Firefox\ Profiles. Delete the History.dat file from each folder in the Profiles folder. Try to start Firefox.
5. Remove extensions and plugins. Using My Computer as shown in Step 4, delete the contents of the C:\ Program Files\Mozilla Firefox\Extensions but not the folder itself. Delete the contents of the C:\Program Files\Mozilla Firefox\Plugins folder but not the folder itself. (If Firefox is installed in a different folder, you will need to change the C:\Program Files\Mozilla Firefox above to correspond to the folder in which you installed Firefox.)
6. Reinstall. If none of these steps work, reinstall Firefox. First, using IE, download the executable at www .mozilla.com. Uninstall Mozilla. Click the Start button and select Control Panel/Add Or Remove Programs. Then click on the listing for Mozilla Firefox and click Remove. After clicking through the removal routine, run the Firefox executable that you downloaded.
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