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This article describes why you can get '''AUS: Update XML File Malformed (200)''' when [[Updating Firefox|Firefox checks for updates]]. __TOC__ = Interfering extension = Disable any extensions that may be blocking access to the update server, such as '''Noscript'''. For more information, see [[Troubleshooting extensions and themes]]. = Firefox can't access secure sites = Firefox uses secure sites when it checks for updates. Make sure your Firefox is able to access secure sites without errors or prompts. # [[T:closeFirefox]] # Start Firefox. # In the Location Bar, type '''https://addons.mozilla.org''' and press {for win,linux}{key Enter}{/for}{for mac}{key Return}{/for}. * If you get an error loading the site, see [[Error loading web sites]]. * If you get a prompt for your master password or for a proxy password, then Firefox is not able to check for updates until you receive that prompt and enter the correct password. As a workaround, you can periodically [[Updating Firefox|check for updates manually]] after you've entered your password. = Incorrect update URL setting = Firefox may be set to use an incorrect address when checking for updates. # [[T:aboutconfig]] # Search for the preference {pref app.update.ur<!-- -->l}. # {for win,linux}Right-click{/for}{for mac}Hold down the {key Ctrl} key while you click{/for} {pref app.update.ur<!-- -->l} and click {menu Reset}. ** If {menu Reset} is disabled, Firefox is already set to use the correct update address, so this isn't your problem. Now that Firefox is configured with the correct address, it may be able to update without error. = Cookies - Incorrectly set or Cannot be set = Firefox may not be able to set or read cookies when it checks for updates. Make sure your Firefox is able set or access cookies, especially when using Stealther and/or other '''Privacy and Security''' add-ons. # Temporarily disable Stealther and/or other '''Privacy and Security''' add-ons. # [[T:optionspreferences]] # Select the {menu Privacy} panel. # Click the {button Show Cookies...} button to open the Cookies window. # Find a cookie beginning with the name '''aus2'''. If it exists, select the site and click {button Remove Cookie(s)}.{for win}<br/> <br/>[[Image:1869a7dceb452cac2e348bc6c6733e4e-1241759761-188-1.jpg]]<br/>{/for} = Eset security software = If you use [http://www.eset.com/ Eset] security software, it is known to cause this error because of the way it checks secure connections. For instructions on how to fix the problem, read [http://kb.eset.com/esetkb/index?page=content&id=SOLN2371 this Eset article]. = Upgrading manually = If nothing else works, you can always download the latest version of Firefox from [http://www.getfirefox.com] and install it over top of your existing version. You won't lose your bookmarks or other settings. To prevent the error dialog from coming up, you can [[Updating Firefox|turn off automatic updates]].