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Firefox includes a Software Update feature that automatically checks for updates and prompts you to install them when necessary. Sometimes, the updater fails and displays an "Update Failed" error message. This article presents possible solutions to this problem and workarounds to get Firefox updated.

Firefox includes a Software Update feature that automatically checks for updates and prompts you to install them when necessary. *For more information about the Software Update feature, see [[Updating Firefox]]. Sometimes, the updater fails and displays an '''Update Failed''' error message. This article presents possible solutions and workarounds to get Firefox updated. __TOC__ =Manual update= One solution is to update Firefox by manually downloading and installing the new version over top of your current version. See [[Installing Firefox]] for details. If you are seeing this error even though you have installed the latest version of Firefox, see [[Updates reported when running newest version]]. = Check for updates after restarting the computer = It's possible that another running program or a previous instance of Firefox that did not close properly is interfering with the Firefox update process. This error can also occur if you share your computer with other users, and another user's account is still logged in with Firefox running. The easiest way to resolve such problems is to restart your computer. Once the computer starts up again: # Start Firefox, # {for win,linux}At the top of the Firefox window{/for}{for mac}On the menu bar{/for}, click on the {for linux}{menu Help} menu{/for}{for mac}{menu Firefox} menu{/for}{for win}{for not fx35}{button Firefox} button, go over to the {menu Help} menu (on Windows XP, click on the {menu Help} menu){/for}{for fx35}{menu Help} menu{/for}{/for}. #Select {for not fx35}{menu About Firefox}. Firefox will begin checking for updates{/for}{for fx35}{menu Check for Updates...}{/for}. {for fx35} * If {menu Check for Updates...} is grayed out, see [[Check for Updates is disabled]]. {/for} = Close other running programs = Some programs that can interfere with Firefox are set to start up automatically when you start your computer. Before updating Firefox, try closing or disabling such programs; for example, Spybot TeaTimer and Logitech QuickCam software have been known to interfere with Firefox updates. {for win} = Run as Administrator = If you are using Windows 7 or Vista: #Restart the computer so that no Firefox processes are active. #Open the Windows Start Menu, type ''firefox'' and right-click on the "Mozilla Firefox" entry that appears. #Select {menu Run as Administrator} and {menu Continue} if the User Account Control dialog comes up. If the issue is not resolved, close Firefox and restart the computer again but this time, open the program folder where Firefox is installed (e.g., open the {filepath C:\Program Files\Mozilla Firefox} folder or, on 64-bit windows, the {filepath C:\Program Files (x86)\Mozilla Firefox} folder), right-click on the '''firefox''' or '''firefox.exe''' file icon and select {menu Run as Administrator}. <!-- http://support.mozilla.com/tiki-view_forum_thread.php?comments_parentId=171013&forumId=1 -->{/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Software_Update#Software_Update_not_working_properly Software Update (mozillaZine KB)]''''' [[Template:ShareArticle|link=http://mzl.la/LqIMFV]]