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

Many common problems with Firefox can be resolved with some of the troubleshooting steps described below. __TOC__ = Standard troubleshooting steps = Take the following steps in order if you are experiencing a problem with Firefox. If one doesn't work, try the next one. == Restart Firefox == Close Firefox completely: [[T:closeFirefox]] Then restart your computer and start Firefox again. {for fx3} == Clear private data == Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache. # Click on the {menu Tools} menu and select {menu Clear Private Data...} to bring up the Clear Private Data window. # Select the following items in the list, and then press {button Clear Private Data Now}: * Download History * Cache * Cookies For more information, see [[Clearing Private Data]]. {/for} {for fx35} == Clear cookies and cache == Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache: # Click on the {menu Tools} menu and select {menu Clear Recent History...} to bring up the Clear Recent History window # In the '''Time range to clear''' drop-down menu, select '''Everything''' # Click the arrow next to '''Details''' to display the list of items to clear, then select the following items: ** Cache ** Cookies # Click {button Clear Now}. For more information, see [[Clear Recent History]]. {/for} == Troubleshoot extensions and themes == Sometimes add-ons for Firefox (extensions or themes) can cause problems. To confirm whether your problem is caused by an add-on, launch Firefox's [[Safe Mode]]: [[T:safemode]] # In the Firefox Safe Mode dialog, click {button Continue in Safe Mode}. # Test for your problem. If the problem does not occur in Safe Mode, an extension or theme is likely the cause. For more information about troubleshooting extensions and themes, and how to narrow down which add-on is causing problems, see [[Troubleshooting extensions and themes]]. == Reset preferences == If the problem was not fixed by disabling add-ons, you may need to revert changes you've made to Firefox's configuration: [[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}. == Troubleshoot plugins == Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems. {for fx3} # Open the Add-ons Window by clicking the {menu Tools} menu and selecting {menu Add-ons} # Click on the Plugins icon at the top of the Add-ons window. # Click each plugin in the list and then click {button Disable}. # Test for your problem. {/for} For more information about various plugins, and what to do if you find the plugin that causes problems, see the [[Troubleshooting plugins]] article. = Further troubleshooting steps = If the steps above don't fix your problem, continue by following these instructions. == Make a new profile == A corrupt profile can cause various problems with Firefox. You can try to make a new profile test whether that solves the problem, and if so, copy your data (bookmarks, saved passwords, etc.) to the new profile. # Start the Profile Manager - see [[Managing profiles#Starting the Profile Manager|Starting the Profile Manager]] for instructions. # Create a new profile - see [[Managing profiles#Creating a profile|Creating a profile]] for instructions. # Click on the newly created profile 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 troubleshooting purposes, only copy the files that correspond to your bookmarks and saved passwords. == Clean reinstall == Some Firefox issues can be resolved by downloading a new Firefox installer from [http://www.mozilla.com/ Mozilla.com], then closing Firefox, deleting the Firefox application folder (program files) and reinstalling Firefox. If this does not help, or if you would rather completely remove Firefox and start over instead of completing all the troubleshooting steps, follow these steps: # Download the latest official version of Firefox from [http://www.mozilla.com/ Mozilla.com]. #* You should avoid unofficial download sites that bundle Firefox with other software such as the Google Toolbar. # If you wish to retain your current profile, you should make a backup copy of it. See [[Backing up your information]] for instructions. # Uninstall Firefox and make sure you remove the Firefox application (program) folder and your Firefox personal data (user data and settings) - see [[Uninstalling Firefox]] for instructions. # Reinstall Firefox - see [[Installing Firefox]] for instructions. # When Firefox is started for the first time, the Import Wizard will appear and a new profile will be created. # Verify that the issue no longer appears. # If you made a backup of your old profile and wish to restore your old information, see [[Recovering important data from an old profile]]. For troubleshooting purposes, only copy the files corresponding to your bookmarks and saved passwords. # Reinstall your extensions and themes one by one to determine if any specific one is causing the issue. {for win} == Other solutions == If you've tried the above steps, including a clean reinstall, the following solutions may help to resolve your problem. ;:{note}'''Note: This section does not contain step-by-step instructions. For more information on any of these solutions, please consult the appropriate documentation that came with your operating system or other software product.'''{/note} == Internet security software == Some Internet security software (including antivirus, antispyware, and firewall programs) can cause problems with Firefox. These can include limited ability to open pages, crashes, and more. If you are using firewall or other Internet security software, verify that the Firefox application is not block from communicating with the Internet. Most of the time you can open a program's settings, remove Firefox from its list of allowed or trusted programs, and then let it re-detect Firefox, and things will start working again. This step is worth repeating, even if you've not had problems with your Internet security software before. If your program is listed at the [[Firewalls]] article, you can get specific instructions for how to properly reconfigure. == Viruses and Spyware. == Periodically, you should scan your system for viruses, spyware, or other malware. One of the following free services may be useful for virus scans: ** [http://security.symantec.com/ Symantec Security Check] - use its Virus Detection option. ** [http://us.mcafee.com/root/mfs/ McAfee FreeScan] ** [http://housecall.trendmicro.com/ Trend Micro HouseCall] Some malware programs may target the Firefox application file. The following instructions may help diagnose such a problem: # [[T:closeFirefox]] # Open the Firefox application folder - by default, it is:<br/>{filepath C:\Program Files\Mozilla Firefox}. # Rename {filepath firefox.exe} to {filepath firefox1.exe}. # Double-click {filepath firefox1.exe} to launch Firefox. # If Firefox runs without problems, some malicious code may be targeting Firefox ({filepath firefox.exe}). Scan your computer for malicious code using the links above or your own antivirus or antispyware program. It's also possible that an ad-blocker, web-accelerator, antivirus or other running program is conflicting with Firefox. Try temporarily disabling these other programs one at a time. == File system errors == If your computer's file system has a problem, that may prevent Firefox from running. Run the error-checking tool [http://support.microsoft.com/?kbid=315265 Chkdsk] on your drive to look for and repair errors. {/for} = For more help = If after following the steps above, you still have problems with Firefox: * Search the [http://support.mozilla.com/tiki-wiki_rankings.php?locale=en-US&limit=500&categId=1 Firefox Knowledge Base] * Visit the [http://support.mozilla.com/forum Firefox Support Forum] * Look at [[Other Firefox Support]] <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Standard_diagnostic_-_Firefox Standard diagnostic - Firefox (mozillaZine KB)]'''''