Replace your Sync information

This article is no longer maintained, so its content might be out of date.

If you are having trouble getting all of your desktop information to show up on your other devices, this article will show you how to fix that by replacing the sync data you have on the server with a new copy from your desktop.

Part 1 - Reset your Firefox Sync account

Warning: This will erase all of your data stored on the server. Data loss is possible.
  1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button Fx89menuButton and select Settings.
  2. Once the optionspreferences window opens, click on the Sync tab.
  3. In the Sync tab click on Manage Account and select My Sync Key.
  4. A new window will open displaying a Sync Key - ignore that and click Generate.
  5. A new Sync Key will be made for you. Please take a moment to print it out or save it on your computer. Then click Change Sync Key
    Lost Key 2
  6. You should see two status messages. The first one will say, "Changing Sync Key and uploading local data, please wait..." and the second one will say, "Your Sync Key was successfully changed!".
  7. Once your Sync Key has been changed the window will close.
    Note: This first sync should happen quickly but may take more than 30 minutes, depending on how much information needs to be synced.
  8. Close the Settings page. Any changes you've made will automatically be saved.
  1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button Fx89menuButton and select Settings.
  2. Once the optionspreferences window opens, click on the Sync tab.
  3. In the Sync tab click on Manage Account and select My Recovery Key.
  4. A new window will open displaying a Recovery Key - ignore that and click Generate a new key.
  5. A new Recovery Key will be made for you. Please take a moment to print it out or save it on your computer. Then click Change Recovery Key
    Change Key - WinLost Key pt3
  6. You should see two status messages. The first one will say, "Changing Recovery Key and uploading local data, please wait..." and the second one will say, "Your Recovery Key was successfully changed!".
  7. Once your Recovery Key has been changed the window will close.
    Note: This first sync should happen quickly but may take more than 30 minutes, depending on how much information needs to be synced.
  8. Close the Settings page. Any changes you've made will automatically be saved.

Part 2 - Re-add your devices

Now that you've changed your Sync KeyRecovery Key, any devices you had connected to your Sync account will stop syncing. You'll have to re-add them to your Sync account by following the steps in How do I set up Sync on my computer? or Use Sync to share your Firefox bookmarks, passwords and more with Firefox for mobile.

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