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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]]. __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 [[Delete browsing, search and download history on Firefox]]. = 3. Restart Firefox in Safe Mode = Firefox Safe Mode is a troubleshooting mode that disables extensions, uses the default theme, turns off hardware acceleration and uses default toolbar settings, among other changes (see [[Troubleshoot Firefox issues using Safe Mode|this article]] for details). To start Firefox in Safe Mode: # [[T:safemode]] # In the Firefox Safe Mode dialog, click {button Start 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,{for not fx75} see {for not fx70}[[Content blocking#w_turn-content-blocking-off-on-individual-sites|Turn content blocking off on individual sites]]{/for}{for fx70}[[Enhanced Tracking Protection in Firefox for desktop#w_what-to-do-if-a-site-seems-broken|What to do if a site seems broken]]{/for}, if certain websites only work correctly while in Firefox Safe Mode. For other issues,{/for} follow [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems#w_the-problem-does-not-occur-in-safe-mode|these instructions]] to troubleshoot extensions, themes and hardware acceleration. = 4. 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. This process will not remove your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox profile]] data (such as bookmarks and passwords), since that information is stored in a different location. {note}'''Note:''' You might want to print these steps or view them in another browser.{/note} {for win} # Download and save the installer for the latest official version of Firefox from [http://www.mozilla.org/firefox#desktop mozilla.org]. # Exit Firefox (if open): [[T:closefirefox]] # You may want to make a note of the Mozilla Firefox program folder location (right-click the Firefox desktop icon, select {menu Properties} from the context menu and click the Shortcut tab) since there may be leftover files and folders after you uninstall Firefox that should be removed for a clean reinstall. # [[Uninstall Firefox from your computer]]. # Delete the Firefox program folder, which is normally found in one of these locations by default: #* {filepath C:\Program Files\Mozilla Firefox} #* {filepath C:\Program Files (x86)\Mozilla Firefox} # Reinstall Firefox using the installer you downloaded earlier - see [[How to download and install 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 from your computer]] by opening the Applications folder in the Finder and dragging the Firefox application to the Trash. # Reinstall Firefox - see [[How to download and install 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 [[Install 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 [[Install Firefox on Linux]] for instructions. {/for} Now start Firefox and check to see if your problem has been fixed. If it hasn't, continue with the next troubleshooting method. = 5. Refresh Firefox = The ''Refresh Firefox'' feature can fix many issues by restoring your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox profile]] to its default state while saving your essential information. [[Template:resetnote]] [[Template:resetsteps]] = 6. Create a new Firefox profile = <!-- Creating a new profile is a common troubleshooting step and fixes issues that a Reset/Refresh doesn't such as a corrupt places.sqlite file. See https://bugzilla.mozilla.org/show_bug.cgi?id=1180419--> Sometimes files in your Firefox [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|profile folder]] that correspond to the essential information that a Firefox Refresh doesn't remove (such as bookmarks and browsing history) may be causing the issue. You can create a new, additional profile which will not contain any of your old Firefox data. See the [[Profile Manager - Create, remove, or switch Firefox profiles]] article for instructions. = Other solutions = If you've tried all of these troubleshooting methods and you're still having problems, here are some other solutions you can try: == Check browser internals == The [[Task Manager - see what tabs or extensions are slowing down Firefox|Firefox Task Manager]] (''about:performance'' page) lets you see what tabs or extensions are slowing down Firefox. [[Share data with Mozilla to help improve Firefox#w_telemetry-data|Telemetry Data shared with Mozilla]] (''about:telemetry'' page) contains detailed data about performance, hardware, usage and customization. The [[Use the Troubleshooting Information page to help fix Firefox issues| Troubleshooting Information page]] (''about:support'' page) includes other ''about:'' page links and troubleshooting resources. (For a list of all ''about:'' pages, enter '''about:about''' in the address bar.) == Troubleshoot the Flash plugin == See [[Flash Plugin - Keep it up to date and troubleshoot problems]]. {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.''' {/for} == Check for malware == [http://wikipedia.org/wiki/Malware Malware] (short for "malicious software") can cause problems with Firefox.{for win} Periodically, you should scan your system for viruses, spyware, or other malware.{/for} For more information, see [[Troubleshoot Firefox issues caused by malware]]. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Standard_diagnostic_-_Firefox Standard diagnostic - Firefox (mozillaZine KB)]'''''