Suspicious activity on my Firefox Account

Firefox Accounts syncs your passwords, bookmarks and history across multiple devices. If you notice suspicious activity on your Firefox Account (like someone signing in from an unknown device), there are steps you can take to prevent further access to your information.

First, change your Sync password from a synced computer

This first step will prevent devices with your old Firefox Accounts password 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 New Fx Menu and choose Options.Preferences.
  2. Click the Sync tab on the left to open the Sync panel.
  3. In the Sync panel, click the Manage Account link to open the Firefox Accounts page.
  4. On the Firefox Accounts 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.
  1. 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. Close the about:preferences page. Any changes you've made will automatically be saved.

When you open Firefox on another connected device, it will prompt you to enter your new Firefox Accounts password. Or you can update your other connected devices with the new password by following these steps:
  1. Disconnect your other devices from Firefox Accounts by following these steps.
  2. Reconnect these same devices by following these instructions.

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

Change your Firefox Accounts password (see previous section) before changing your other account passwords to prevent your new passwords from syncing with devices.

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 using the existing already synced password.

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

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