Update Firefox

Update Firefox to the latest version

By default, Firefox is set to automatically update itself but you can always do a manual update. Here’s how:

  1. On the menu bar click the Firefox menu and select About Firefox.
  2. The About Firefox window will open and Firefox will begin checking for updates and downloading them automatically.
  3. When the updates are ready to be installed, click Restart to Update.
Important: If the update didn’t start, didn’t complete or there was some other problem, please download and install the latest Firefox version from mozilla.org for your operating system and language.

Fix problems connecting to websites after updating Firefox

This article describes how to troubleshoot problems connecting to websites that start immediately after updating Firefox to a new version.

The cause

If you were able to load websites until you updated Firefox, your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) is likely preventing Firefox from connecting to the Internet.

This problem occurs when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted.

Note: In some cases, disabling an Internet security program or firewall does not stop all of its parts from being active. A program that reports that it is disabled may still be able to block Firefox.

Fixing the problem

To allow Firefox to connect to the Internet again:

  1. Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
  2. Remove Firefox from your program’s list of trusted or recognized programs, then add it back. For detailed instructions, see Configure firewalls so that Firefox can access the Internet.

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.

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

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:

  1. Start Firefox,
  2. On the menu bar, click on the Firefox menu
  3. Select About Firefox. Firefox will begin checking for updates.

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.

How to update to the new Firefox Sync

The latest Firefox includes a new version of Sync. This article will show you how to update. Don’t want to update right away? No problem. Sync will continue to work as before for now, with one exception that we’ll explain.

What’s different about the new Sync?

Signing in to the new Sync is easy to do with a Firefox account. No more pairing codes or recovery keys. Just sign in with your email and password and you’re set.

How to update to the new Sync

The new version of Sync only works with the latest Firefox and you can’t use both the old and new Sync at the same time. So in order to create a Firefox account and sign in to the new Sync you’ll have to unlink all of your current devices from the old version of Sync.

On a computer:

  1. Click the menu button New Fx Menu and choose Preferences.

  2. Select the Sync panel.
  3. In the Sync panel click Unlink This Device.
  4. Close the Preferences window.
  5. Restart Firefox.

On an Android device:

  1. Open your device’s Settings app (not Firefox’s Settings menu).
  2. Under Accounts or Accounts and Sync, tap on Firefox.
  3. Tap your account name (usually your email address) to view the account settings.
  4. Tap the menu at the top right corner of your device and choose Remove account.

Step 2: Update all of your other devices to the latest Firefox

Step 3: Create a Firefox account

On a computer:

  • Click the menu button New Fx Menu and choose Sign in to Sync and follow the instructions to create your account.

On an Android device:

  • Tap the Menu button (either below the screen on some devices or at the top right corner of the browser) , select Settings (you may need to tap More first) and thenSync. Follow the instructions to create your account.
Note: You can use the same email address that you used to set up the old Sync.

Step 4: Sign in to Sync on your other devices

On a computer:

  1. Click the menu button New Fx Menu and choose Sign in to Sync.
  2. Click Get Started and then choose the Already have an account? Sign in. link at the bottom.

On an Android device:

  1. Tap the Menu button (either below the screen on some devices or at the top right corner of the browser) , select Settings (you may need to tap More first) and thenSync.
  2. Tap Get Started and then choose the Already have an account? Sign in. link at the bottom.

What if I don’t want to update to the new Sync?

  • While the old version of Sync will continue to work, the latest version of Firefox doesn’t support adding new devices to the old version of Sync. This means that you won’t be able to sync with a new device.
  • Mozilla will continue to host the old version of Sync for a limited time to allow for migration to Firefox Accounts. Self-hosted users will soon be able to run their own instance.
  • Learn more about Firefox accounts