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Some problems with Firefox are caused by extensions or themes. This article will help you determine whether an extension or theme is causing your problem and, if it is, describe how to make Firefox run normally again. __TOC__ = Start Firefox in Safe Mode = When you start in Firefox's [[Safe Mode]], all extensions are temporarily disabled and the default theme is used. This will help determine whether an extension or theme is causing your problem. [[T:safemode]] # When the Firefox Safe Mode window appears, press the button {button Continue in Safe Mode}. After Firefox starts in Safe Mode, test for your problem. == The problem still occurs in Safe Mode == If your problem persists in Safe Mode, it is not being caused by an extension or theme. Other possible causes could be plugins or changes made to Firefox preference settings, which are not disabled in Safe Mode. * For additional troubleshooting suggestions, see [[Basic Troubleshooting]], [[Troubleshooting plugins]], and [[Resetting preferences]]. == The problem does not occur in Safe Mode == If your problem did not occur in Safe Mode, it is most likely because of an extension or theme. Continue following the steps in this article to determine whether an extension or theme is causing your problem. = Switch to the default theme = If you are using a theme other than the default Firefox theme: # Click on the {menu Tools} menu, and select {menu Add-ons}. The Add-ons window appears. # In the Add-ons window, click the {menu Themes} panel. # Select the default theme, then click the {button Use Theme} button, to make Firefox switch to that theme. # Click {button Restart Firefox}. After you restart Firefox, test for your problem. If it no longer occurs, the theme you were using was causing it. If it still occurs, continue following the steps in this article. = Disable all extensions = To determine whether a faulty extension is causing your problem, you can disable all of your installed extensions: # Click the {menu Tools} menu and then select {menu Add-ons}. The Add-ons window appears. # In the Add-ons window, click the {menu Extensions} panel. The list of installed extensions appears. # Click the name of an extension the list to select it. # Click {button Disable} to disable the selected extension. # Repeat for each of the other extensions in the list. # Click {button Restart Firefox}. After you restart Firefox, all extensions will be disabled. Test for your problem. *If the problem still occurs with all extensions disabled, it is most likely that the {filepath localstore.rdf} file in your Firefox profile is corrupt. You can [[Toolbar keeps resetting#Fixing the problem|Reset toolbars and controls]] to resolve the problem. If the problem no longer occurs with all extensions disabled, one of your extensions was causing it. To find the extension that was causing your problem, continue as follows: == Test for faulty extensions == To determine which of your disabled extensions was causing your problem, you can re-enable each extension one at a time. # Click the {menu Tools} menu and then select {menu Add-ons}. The Add-ons window appears. # In the Add-ons window, click the {menu Extensions} panel. The list of installed extensions appears. # Click the name of an extension the list to select it. # Click {button Enable} to enable the selected extension. # Click {button Restart Firefox}. After you restart Firefox, test for your problem. If the problem comes back, the extension you just enabled was causing it. {note}'''Note''': If you have a large number of extensions, it may be quicker to enable more than one extension at a time. The method with the fewest number of restarts required is: Enable half the extensions in this list, then restart Firefox and test for the problem. If the problem reoccurs, you know that the faulty extension is one of the ones you just enabled. If the problem does not occur, you know the faulty extension is one of the disabled ones. Repeat the process until the faulty extension is found.{/note} After you find the extension that was causing your problem, disable or uninstall the faulty extension and re-enable the other extensions in the Add-ons window. = Updating themes = If an installed theme was causing your problem, it may have an update available that will fix it: # Click on the {menu Tools} menu and then choose {menu Add-ons}. The Add-ons window appears. # In the Add-ons window, click the {menu Themes} panel. # To check for updates for installed themes, click {button Find Updates}. # If updates are found, install them by clicking {button Install Updates}. # When the installation is complete, click {button Restart Firefox}. After Firefox restarts, your themes will be updated. If the theme that was causing your problem had an update, re-enable it and test for your problem again. = Updating extensions = If an extension was causing your problem, it may have an update available that will fix it: # Click the {menu Tools} menu and then choose {menu Add-ons}. The Add-ons window appears. # In the Add-ons window, click the {menu Extensions} panel. # Click {button Find Updates}. # If updates are found, install them by clicking {button Install Updates}. # When the installation is complete, click {button Restart Firefox}. After Firefox restarts, your extensions will be updated. If the extension that was causing your problem had an update, re-enable it and test for your problem again.