Disable Firefox Sync on a lost phone or tablet

Revision Information
  • Revision id: 12526
  • Created:
  • Creator: Michael Verdi
  • Comment: 1st draft
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: zzxc
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: zzxc
Revision Source
Revision Content

So you've just lost your phone (sorry about that) and you realize you've been using Firefox Sync to get all of your usernames and passwords on it. Here's what you should do:

First, change your sync password

  1. (In Firefox for desktop) Click the menu button Fx89menuButton to open the menu panel.
  2. Click your Mozilla account name or email address (or click Sign in).
  3. Click Manage Account
  4. On the Mozilla account page, scroll down to the Security section and click the Change button next to Password.
  5. Follow the steps to enter your old and new passwords, then click Save to finish.

Second, change all of your account passwords

It's important that you change your sync password before changing your other account passwords so that your phone doesn't get a copy of your new passwords.

This part is more time consuming but vital. If you don't change the passwords for things like your bank account, it would still be possible for someone with your phone to log into your account.

See Choose a strong password for an easy way to create better passwords.