Firefox Sync troubleshooting and tips

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

How do I fix Sync problems that display an error message?

The following procedures will help you fix Sync errors.

How do I resolve an incorrect name or password error?

If the "Sync encountered an error while connecting: Incorrect name or password. Please try again." error appears in the bottom error bar, complete the following steps:

  1. Click Preferences.... The Sync panel will display.
  2. Click Update. The Update Password window will open.
  3. Enter your new password in the window.
  4. Click Update Password to close the window and connect to Sync.

How do I resolve a wrong sync key error?

If the "Sync encountered an error while connecting: Wrong Sync Key. Please try again." error message appears in the bottom error bar, complete the following steps:

  1. Click Preferences.... The Sync panel will display.
  2. Click Update. The Update Sync Key window will open.
  3. Get a copy of your Sync Key from the device where you generated the new Sync Key. For more, see the Where can I find my Firefox Sync key? section in How do I choose what types of information to sync on Firefox?.
  4. Enter your new Sync Key in the window.
  5. Click Update Sync Key to close the window and connect to Sync.

How do I solve Sync problems without an error message?

The following problems do not display an error message:

  • Your Sync client isn't compatible with the data you have on the Sync server.
  • The Sync servers are having issues to handle your data.
  • The Sync servers are under a heavy load - in this case, the error will stop when the server load returns to normal.

Follow these steps in order until one of them fixes the Sync problem:

Check to see if other extensions are interfering with Firefox Sync

  1. Disable all extensions and themes except Firefox Sync.
  2. Then test for faulty extensions or themes.

For more information on how to troubleshoot extensions and themes, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Uninstalling or Deactivating Firefox Sync

  • If you are using FireFox 3 or earlier, Sync is installed as an Add-On, so it needs to be uninstalled. For detailed instructions about how to uninstall add-ons, see [[Uninstalling add-ons] and in particular look for the add-0n "Firefox Sync"].
  • For Firefox 4 and later versions, Sync is part of the browser itself. In this case you deactivate SYNC by going to <Options>,<Tools>,<Sync> and click at the bottom of the window on "Deactivate This Device".


Update Firefox and the Sync add-on on all your devices

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. Update Firefox and download the latest Firefox Sync add-on.

Note: After updating, you may need to connect your device again. See How do I add a device to Firefox Sync?

Reset your Sync data

In some cases where you are getting regular errors and restarting Firefox or waiting doesn’t solve the issue, you can try to reset your Sync data. In order to do so, see the How do I reset my Sync data? section of the How do I choose what types of information to sync on Firefox? article.