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Most issues with Firefox can be solved by working through these troubleshooting steps. Just start at the beginning and keep going until the problem is fixed.

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 [[Get community support|a community of volunteers standing by]]. {note}'''Note:''' Check [/products/firefox/hot Firefox hot topics] to see if the problem you are seeing has a solution.{/note} __TOC__ {for fx13} = 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 [[Remove recent browsing, search and download history]]. = 3. Restart Firefox in Safe Mode = [[Troubleshoot Firefox issues using Safe Mode|Safe Mode]] is a troubleshooting mode that disables all extensions, uses the default theme, turns off hardware acceleration, and uses default toolbar settings and controls, among other things. To start Firefox in Safe Mode: # [[T:safemode]] # In the Firefox Safe Mode dialog, click {for not fx15}{button Continue in Safe Mode}{/for}{for fx15}{button Start in Safe Mode}{/for}. # Check whether your problem is still happening while in Safe Mode. *If the problem still happens in Safe Mode, go on to step 4. *If the problem does not happen in Safe Mode, see the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article and follow the instructions under [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems#w_the-problem-does-not-occur-in-safe-mode|The problem does not occur in Safe Mode]] to narrow down the cause. = 4. Troubleshoot your plugins = Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems that may be fixed in the latest version. To check to see if you have the latest versions of all your plugins, go to our [https://www.mozilla.org/plugincheck Plugin Check page] If any of your plugins are out of date, click {button Update} and follow the instructions for updating that plugin.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 the problem still happens, you can disable all of your plugins to see if one of them is the cause: {for not fx23} # [[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. {/for} {for fx23} # [[T:Open Add-ons|type=Plugins]] # Click each plugin in the list and then select {button Never Activate} in its drop-down menu. # Check whether your problem happens when you have all plugins disabled. {/for} If your problem goes away when all of your plugins are disabled, see the [[Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems]] article to learn how to narrow down which one is causing it. = 5. 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}'''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.org/firefox#desktop mozilla.org]. # Exit Firefox: [[T:closefirefox]] # Delete the Firefox installation folder, which is located in one of these locations, by default: #* '''(32-bit Windows)''' {filepath C:\Program Files\Mozilla Firefox} #* '''(64-bit Windows)''' {filepath C:\Program Files (x86)\Mozilla Firefox} # Reinstall Firefox - see [[Installing Firefox on Windows]] for instructions. {/for} {for mac} # Download the latest official version of Firefox from [http://www.mozilla.org/firefox#desktop mozilla.org]. # Quit Firefox: [[T:closefirefox]] # Uninstall Firefox by opening the Applications folder in the Finder and dragging the Firefox application to the Trash. # Reinstall Firefox - see [[Installing Firefox on Mac]] for instructions. {/for} {for linux} # Download the latest official version of Firefox from [http://www.mozilla.org/firefox#desktop mozilla.org]. # Quit Firefox: [[T:closefirefox]] # Uninstall Firefox - If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]] for details. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory to uninstall Firefox. # Reinstall Firefox - see [[Installing Firefox on Linux]] 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 3 above) were not causing problems. If your problem hasn't been fixed continue with the next troubleshooting method. = 6. Reset Firefox = The [[Reset Firefox – easily fix most problems|Reset Firefox feature]] can fix many issues by restoring Firefox to its factory default state while saving your essential information. [[Template:resetnote]] [[Template:resetsteps]] {/for} {for not fx13} = 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 [[Remove recent browsing, search and download history]]. = 3. Restart Firefox in Safe Mode = [[Troubleshoot Firefox issues using Safe Mode|Safe Mode]] is a troubleshooting mode that disables all extensions, uses the default theme, turns off hardware acceleration, and uses default toolbar settings and controls, among other things. To start Firefox in Safe Mode: # [[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 still happens in Safe Mode, go on to step 4. *If the problem does not happen in Safe Mode, see the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article and follow the instructions under [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems#w_the-problem-does-not-occur-in-safe-mode|The problem does not occur in Safe Mode]] to narrow down the cause. = 4. Troubleshoot your plugins = Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems that may be fixed in the latest version. To check to see if you have the latest versions of all your plugins, go to our [https://www.mozilla.org/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 the problem still happens, you can disable all of your plugins to see if one of them 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 [[Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems]] article to learn how to narrow down which one is causing it. = 5. Reset your Firefox settings = Some problems can be fixed by resetting your Firefox preference settings: # [[T:safemode]] # In the Firefox Safe Mode dialog, click to put a check mark by '''Reset all user preferences to Firefox defaults'''. # 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}'''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.org/firefox#desktop mozilla.org]. # Exit Firefox: [[T:closefirefox]] # Delete the Firefox installation folder which is located here by default: #* '''(32-bit Windows)''' {filepath C:\Program Files\Mozilla Firefox} #* '''(64-bit Windows)''' {filepath C:\Program Files (x86)\Mozilla Firefox} # Reinstall Firefox - see [[Installing Firefox on Windows]] for instructions. {/for} {for mac} # Download the latest official version of Firefox from [http://www.mozilla.org/firefox#desktop mozilla.org]. # Quit Firefox: [[T:closefirefox]] # Uninstall Firefox by opening the Applications folder in the Finder and dragging the Firefox application to the Trash. # Reinstall Firefox - see [[Installing Firefox on Mac]] for instructions. {/for} {for linux} # Download the latest official version of Firefox from [http://www.mozilla.org/firefox#desktop mozilla.org]. # Quit Firefox: [[T:closefirefox]] # Uninstall Firefox - If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]] for details. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory to uninstall Firefox. # Reinstall Firefox - see [[Installing Firefox on Linux]] 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 3 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 [[Use the Profile Manager to create and remove Firefox 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} = Other solutions = If you've tried all of these troubleshooting methods and you're still having problems the issue may be with {for win}other software or {/for}hardware. {note}This section does not contain step-by-step instructions. For more information on any of these solutions, please check the related documentation.{/note} {for win} == 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 [[Configure firewalls so that Firefox can access the Internet]] 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 malware removal tools are often useful: * [http://www.malwarebytes.org/products/malwarebytes_free/ Malwarebytes' Anti-Malware Free] * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] If you need more help removing malware, see [[Troubleshoot Firefox issues caused by malware]]. {/for} == Check your hard drive and RAM for errors == A problem with your computer's hard drive or RAM may prevent Firefox from running or make it crash repeatedly. Here are instructions or tools for checking: {for winxp} * your hard drive: [http://support.microsoft.com/?kbid=315265 How to perform disk error checking in Windows XP] on microsoft<!---->.com. {/for} {for win7} * your hard drive: [http://windows.microsoft.com/en-US/windows7/Check-a-drive-for-errors Check a drive for errors] on microsoft<!---->.com. {/for} {for win8} * your hard drive: [http://windows.microsoft.com/en-us/windows-8/improve-performance-optimizing-hard-drive Improve performance by optimizing your hard drive - To repair a drive] on microsoft<!---->.com. {/for} {for mac} * your hard drive: [http://support.apple.com/kb/HT1782 Using Disk Utility to verify or repair disks] on apple<!---->.com {/for} {for linux} * your hard drive: [https://help.ubuntu.com/community/Smartmontools#Testing_a_Drive Testing a drive with Smartmontools] on ubuntu<!---->.com {/for} * your RAM: {for win, linux}[http://www.memtest.org/ Memtest86+]{/for}{for mac}[http://www.kelleycomputing.net:16080/rember/ Rember]{/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Standard_diagnostic_-_Firefox Standard diagnostic - Firefox (mozillaZine KB)]''''' [[Template:ShareArticle|link=http://mzl.la/NYkV1X]]