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Showing content from http://support.mozilla.org/en-US/kb/update-failed-error-message-when-updating below:

How to fix the Update Failed error message when updating Firefox

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 Update Firefox to the latest release.

Sometimes, the updater fails and displays an Update Failed error message. This article presents possible solutions and workarounds to get Firefox updated.

One solution is to update Firefox by manually downloading and installing the new version over top of your current version. See How to install Firefox on WindowsInstall Firefox on LinuxHow to download and install Firefox on Mac for instructions.

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:

1. Start Firefox.
2. Click the menu button and click .On the Menu bar, click the menu.
3. Select . Firefox will begin checking for updates.

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.

If you are using Windows 7 or Vista:

1. Restart the computer so that no Firefox processes are active.
2. Open the Windows Start Menu, type firefox and right-click on the Mozilla Firefox entry that appears.
3. Select and 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 C:\Program Files\Mozilla Firefox folder or, on 64-bit windows, the C:\Program Files (x86)\Mozilla Firefox folder), right-click on the firefox or firefox.exe file icon and select .

Still can't update Firefox?
If you're using a school or work computer, IT admins may lock updates to a specific version to prevent users from updating the application. As a result, when users try to manually update Firefox to a newer version, they won't see any updates available, or they'll see the message that they're already running the latest version as set by their IT admin.

Based on information from Software Update (mozillaZine KB)

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