Disable Firefox Sync on a lost phone or tablet

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So you've just lost your device (sorry about that) and you realize you've been using Firefox Sync to get all of your usernames and passwords on it. This article describes what you should do to prevent someone from accessing your passwords on your lost device.

First, change your sync password from a synced computer

This first step will prevent your lost phone from connecting to the sync server and getting all of the new passwords that you will have to create in the next section.

  1. At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

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

  2. Go to the Sync panel and click the arrow next to Manage Account to expand the menu.
  3. Click Change Password. The Change Your Password window will pop up.
  4. Enter your new password and click Change Password.
  5. Click OK to close the Options window.Click Close to close the Preferences window.Close the Preferences window.
  1. At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

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

  2. In the Sync panel, click on the Manage link next to your account name to open the Manage account page.
  3. On the Manage account page, click on Change password.
  4. Enter your new password in the field and click the Change Password button.
  5. Click OK to close the Options window.Click Close to close the Preferences window.Close the Preferences window.
  1. At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

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

  2. Go to the Sync panel and click the arrow next to Manage Account to expand the menu.
  3. Click Change Password. The Change Your Password window will pop up.
  4. Enter your new password and click Change Password.
  5. Click OK to close the Options window.Click Close to close the Preferences window.Close the Preferences window.

Second, change all of your account passwords from a synced computer

It's important that you change your sync password before changing your other account passwords so that your lost device doesn't sync your new passwords.

This part is more time consuming but important. If you don't change the passwords for things like your bank account, it would still be possible for someone else to log in to your account on your lost device.

See Create secure passwords to keep your identity safe for an easy way to create better passwords.

If you've set a master password on your other device and you didn't leave Firefox open, you don't need to do anything else.


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