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Follow these troubleshooting steps to determine if an extension, theme or hardware acceleration is the cause of a Firefox problem. Then get steps to repair.

Some problems with Firefox are caused by [https://support.mozilla.org/en-US/kb/extensions-add-features-to-firefox extensions], [https://support.mozilla.org/en-US/kb/use-themes-change-look-of-firefox themes] or [https://hacks.mozilla.org/2010/09/hardware-acceleration/ hardware acceleration]. This article will help you determine whether one of these is causing your problem and, if it is, describe how to make Firefox run normally again. {for fx13} {note}'''Note:''' [[Template:reset-fx]]{/note} {/for} __TOC__ = Start Firefox in Safe Mode = When you start in Firefox's [[Troubleshoot Firefox issues using Safe Mode|Safe Mode]], all extensions are temporarily disabled, hardware acceleration is turned off and the default theme is used. This will help determine whether one of these is causing your problem. # [[T:safemode]] # When the Firefox Safe Mode window appears, press the button {for not fx15}{button Continue in Safe Mode}{/for}{for fx15}{button Start in Safe Mode}{/for}. 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, theme or hardware acceleration. 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 [[Troubleshoot and diagnose Firefox problems]], [[Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems]], and [[Reset Firefox preferences to troubleshoot and fix problems]]. == 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, theme or hardware acceleration. Continue following the steps in this article to determine the cause of your problem. = Turn off hardware acceleration = With some graphics card and graphics driver setups, Firefox may crash or have trouble showing text or objects on pages when using hardware acceleration. You can try turning off hardware acceleration to see if it fixes the problem. # [[T:optionspreferences]] # Select the {menu Advanced} panel and the {menu General} tab. # Uncheck '''Use hardware acceleration when available'''. #[[T:closeFirefox]] #Start Firefox the way you normally do. If the problem is no longer happening, then hardware acceleration was likely the cause. You can try [[How do I upgrade my graphics drivers?|updating your graphics drivers]] to see if that fixes it or simply run without hardware acceleration. Otherwise, your problem is likely related to extensions or themes. Continue with the steps in this article to see if they help. = Switch to the default theme = If you are using a theme other than the default Firefox theme: # [[T:Open Add-ons|type=Appearance]] # Select the default theme, then click the {button Enable} button, to make Firefox switch to that theme. # Click {button Restart Firefox} if necessary. 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: # [[T:Open Add-ons|type=Extensions]] # Click the name of an extension in the list to select it. # Click {button Disable} to disable the selected extension. # Repeat this 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. {for not fx13} *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 [[Changes to toolbars and window sizes are not saved#w_fixing-the-problem|reset toolbars and controls]] to resolve the problem. {/for} 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. # [[T:Open Add-ons|type=Extensions]] # Click the name of an extension in 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 extensions = If an extension was causing your problem, it may have an update available that will fix it: # [[T:Open Add-ons|type=Extensions]] # 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. =Checking extension settings= Some problems are caused if the settings of an extension override Firefox settings (e.g. problems with toolbars). Therefore you may want to check the extension's settings to see if you can find the option that is causing your problem: # [[T:Open Add-ons|type=Extensions]] # For the extension that is causing your problem click the {for win}{button Options}{/for}{for mac,linux}{button Preferences}{/for} button. # Click your way through the settings to see if there is an option that may solve your problem. # If you found a suitable option, click {button Save} and {button Restart Firefox}. [[Template:ShareArticle|link=http://mzl.la/MAyOQc]]