Troubleshoot and diagnose Firefox problems
Most problems with Firefox can be fixed by following the troubleshooting methods described below. Try these steps in order. If one doesn't work, move on to the next one. If you need extra help with any of this, we have Mozilla Firefox Help 1. Restart your computer Sometimes problems can be fixed by simply restarting your computer and then starting Firefox again. 2. Clear your cookies and cache Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache: Click the Library button on your toolbar. (If you don't see it there, click the menu button then click Library .) Click History and select Clear Recent History… . In the Time Range to clear: drop-down, select Everything . Below the drop-down menu, select both Cookies and Cache . Make sure other items you want to keep are not selected. Click Clear Now . For more information, see Delete bro...