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Firefox - Disable Sync on a lost Phone or Tablet

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. Click the menu button Firefox Menu icon and choose Preferences.
  2. Click the Firefox Account tab on the left.
  3. In the Firefox Account panel, click the Manage Account link.
  4. On your Firefox Account page, click the Change… button next to Password.
  5. Enter your old and new passwords in their respective fields and click the Change button to finish.
  6. Close the about:preferences page. Any changes you've made will automatically be saved.

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.

If you have any questions, come by the Help Desk at Hardman & Jacobs Undergraduate Learning Center Room 105, call 646-1840, or email us at

Keywords:Disable Firefox Sync on a lost phone or tablet internet web browser   Doc ID:82326
Owner:John B.Group:New Mexico State University
Created:2018-05-17 10:23 MDTUpdated:2018-05-17 10:53 MDT
Sites:New Mexico State University
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