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Many common problems with Firefox can be fixed with these basic troubleshooting steps.

Most problems with Firefox can be fixed by following the troubleshooting methods described below. Try these in order. If one doesn't work, move on to the next. If you need extra help with any of this, we have [[Ask a question|a community of volunteers standing by]]. __TOC__ = 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: [[T:clearCookiesCache]] For more information, see [[Clear Recent History]]. = 3. Update and troubleshoot your plugins = Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems. Often this is because they are out of date. To check to see if you have the latest versions of all your plugins, go to our [http://www.mozilla.com/plugincheck Plugin Check page]: #If any of your plugins are out of date, click {button Update} and follow the instructions for updating that plugin. #After you've updated all of your plugins, restart Firefox #*[[T:closefirefox]] Then start Firefox again. If you are still having a problem after updating your plugins, it could be that you have a plugin that no longer works with Firefox. To see if this is the issue, disable all of your plugins. If the problem goes away, it's likely that a plugin is the cause: # [[T:Open Add-ons|type=Plugins]] # Click each plugin in the list and then click {button Disable}. # Check whether your problem happens when you have all plugins disabled. If your problem goes away when all of your plugins are disabled, see the [[Troubleshooting plugins]] article to learn how to narrow down which one is causing it. = 4. Troubleshoot your extensions and themes = Sometimes add-ons for Firefox (extensions or themes) can cause problems. To see whether your problem is caused by an extension or theme, disable them all by restarting Firefox in [[Safe Mode]]. If the problem does not happen in Safe Mode, it's likely that an extension or theme is the cause: # [[T:safemode]] # In the Firefox Safe Mode dialog, click {button Continue in Safe Mode}. # Check whether your problem is still happening while in Safe Mode. If the problem doesn't happen in Safe Mode, see [[Troubleshooting extensions and themes]] to learn how to narrow down which one is causing it. = 5. Reset Firefox's {for win}options{/for}{for mac,linux}preferences{/for} = If the problem was not fixed by disabling add-ons, you may need to reset all of Firefox's {for win}options{/for}{for mac,linux}preferences{/for}: # [[T:safemode]] # In the Firefox Safe Mode dialog, click to put a check mark by '''Reset all user preferences to Firefox defaults''' and '''Reset toolbars and controls'''. # To apply your changes, click {button Make Changes and Restart}. = 6. Reinstall Firefox = Some Firefox issues can be caused by a problem with one of the Firefox program files. Follow these steps to completely remove and reinstall Firefox. {note}You might want to print these steps or view them in another browser.{/note} {for win} # Download the latest official version of Firefox from [http://www.mozilla.com/ Mozilla.com]. # Exit Firefox: [[T:closefirefox]] # Uninstall Firefox - see [[Uninstalling Firefox]] for instructions. {warning}During the uninstalling process, '''do not select the option to Remove my Firefox personal data and customizations'''. You will lose all of your bookmarks, history, passwords and settings.{/warning} # After running the unistaller, be sure to also delete the Firefox installation folder which is located here by default: {filepath C:\Program files\Mozilla Firefox} # Reinstall Firefox - see [[Installing Firefox on Windows]] for instructions. {/for} {for mac,linux} # Download the latest official version of Firefox from [http://www.mozilla.com/ Mozilla.com]. # Quit Firefox: [[T:closefirefox]] # Uninstall Firefox - see [[Uninstalling Firefox]] for instructions. {warning}When following the uninstall instructions, '''do not perform the additional steps of removing user data and settings'''. You will lose all of your bookmarks, history, passwords and settings.{/warning} # Reinstall Firefox - see {for mac}[[Installing Firefox on Mac]]{/for}{for linux}[[Installing Firefox on Linux]]{/for} for instructions. {/for} Now start Firefox and check to see if your problem has been fixed. If it has, you can reinstall the extensions and themes you verified (in part 4 above) were not causing problems. If your problem hasn't been fixed continue with the next troubleshooting method. = 7. Make a new profile = A bad profile can cause all kinds of problems with Firefox. To see whether your problem is caused by a bad profile, make a new one. If that fixes the problem, you can copy your data (bookmarks, saved passwords, etc.) over to the new profile. # Use the instructions in the [[Managing profiles]] article to start the Profile Manager and create a new profile.{warning}When creating a new profile, '''do not delete your old profile'''. You will lose all of your bookmarks, history, passwords and settings.{/warning} # Once you've created a new profile, select it in the Profile Manager and click {button Start Firefox}. Test to see if your problem occurs with the new profile. If it doesn't, you can copy your data to the new profile - see [[Recovering important data from an old profile]] for instructions. {for win} = Other solutions = If you've tried all of these troubleshooting methods and you're still having problems the issue may be with other software or your Windows system. {note}This section does not contain step-by-step instructions. For more information on any of these solutions, please check the related documentation.{/note} == Check for conflicts with your Internet security software == Some Internet security software (including antivirus, antispyware, and firewall programs) can cause problems with Firefox including blocking it from opening websites, crashes, and more. Often you can open the program's settings, remove Firefox from its list of allowed or trusted programs and it will be re-detected and things should start working again. '''If your program is listed at the [[Firewalls]] article, you can get specific instructions for how to properly reconfigure it.''' == Scan your system for viruses and spyware == Periodically, you should scan your system for viruses, spyware, or other malware. These free services are often useful: * [http://www.malwarebytes.org Malwarebytes] * [http://www.microsoft.com/security_essentials Microsoft Security Essentials] == Check your hard drive for errors == A problem with your computer's hard drive may prevent Firefox from running. Here are instructions for checking your hard drive: *[http://support.microsoft.com/?kbid=315265 How to perform disk error checking in Windows XP] on microsoft.com. *[http://windows.microsoft.com/en-US/windows-vista/Check-your-hard-disk-for-errors Check your hard disk for errors on Windows Vista / 7] on microsoft.com. {/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Standard_diagnostic_-_Firefox Standard diagnostic - Firefox (mozillaZine KB)]'''''