Firefox Sync troubleshooting and tips

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Before you begin: Please check the Cloud Services Status to make sure that your service isn't temporarily down.

If you've run into a problem with Firefox Sync, this article will walk you through the most common solutions.

I set up Firefox Sync but nothing is syncing

Your devices need to be on the new version of Sync in order for them to share information with each other. If any of your devices are still on the old Sync, you must unlink them before setting them up with the new Sync. Please see Sync your Firefox bookmarks, history, passwords and more for step-by-step instructions.

I've lost my Sync account information

If you're unable to connect to Firefox Sync because you've lost Sync account information, see I've lost my Firefox Sync account information - What to do.

I'm unable to sync my passwords in Firefox for Android

Passwords will stop syncing in Firefox for Android once the master password has been set. See Using Master Password on Firefox for Android for more info.

My bookmarks aren't syncing to Firefox for Android

If you have more than 5,000 bookmarks in your Firefox profile, Firefox for Android won't sync them. Some limitations in Android and Sync itself make larger quantities of bookmarks unreliable, so this limit is there to protect your data.

Firefox Sync resets every time I close Firefox

This happens when you have Firefox set to delete passwords when it's closed. If you've selected Use custom settings for history in the Privacy panel, you'll need to follow these steps:

  1. Click the menu button New Fx Menu Fx57Menu and choose Options.Preferences.
  2. Select the Privacy panel.
  3. In the Firefox will: menu, select Use custom settings for history and ensure that Clear history when Firefox closes is unchecked.
  4. If you want or need to keep this setting checked, click the Settings... button next to it and then uncheck Saved passwords in the Data section.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.

How do I resolve an incorrect name or password error?

If you change your Sync password, you might see this error message on your other devices "Sync encountered an error while connecting: Incorrect name or password." error appears in the bottom error bar. You can update your password on your device by completing the following steps:

  1. Click the menu button New Fx Menu Fx57Menu and choose Options.Preferences.
  2. Select the Sync panel.
  3. Click Sign in and enter your password in the sign in page.
  4. Click Sign in to sign back in to Sync.

Other devices disconnect when I update Firefox

To improve the Sync service, the Sync data format may be changed when the latest Firefox version is released. This means that any of your other devices which have not been updated will need to be updated in order to keep syncing. See Update Firefox for more information.

Note: After updating, you may need to reconnect your device.

Firefox Sync shows a "Cookies are still disabled" error message

If you see the Cookies are still disabled error message, change your permissions for Firefox Accounts to allow cookies.

Sync cookes disabled error

Here's how to do it:

  1. Go to
  2. Click on the lock icon in the address bar.
  3. Click on More Information button.
  4. Click on the Permissions tab.
  5. Scroll down to Set Cookies and select Allow.
  6. Restart Firefox.

If this does not help, please make sure that there are no add-ons blocking cookies for

For advanced users: Make sure DOM Storage is enabled:

  1. In the address bar, type about:config and press EnterReturn.

    • The about:config "This might void your warranty!" warning page may appear. Click I accept the risk! to continue to the about:config page.
  2. In the filter search for
  3. Make sure the value is set to true. If not, double-click to change it.
  4. Restart Firefox and sign in once more to

See also