How do I set up Sync on my computer?

Action required: Update Firefox to maintain account sync post-March 31, 2024.

If you are running a version of Firefox equal to or older than Firefox 78 (general release or ESR) and you have a Mozilla account, you must follow these steps to ensure continued operation of your account in Firefox:

  1. Make sure you remember your password for your account on Firefox. If you do not have your password, you can use your account recovery keys to change your password. If you do not already have account recovery keys, you will need to reset your password without recovery keys.
  2. Backup your profile folder, just in case anything goes wrong.
  3. Update your Firefox browser.
    If you get an error when trying to update, you can reinstall Firefox.
  4. Sign back in to your account in the newly-updated Firefox.

A Mozilla account lets you sync your data and preferences (such as your bookmarks, history, passwords, open tabs and installed add-ons) across all your devices.

Create a Mozilla account

You will need a Mozilla account to enable Sync. Learn how to sign up for a Mozilla account.

Choose what information to sync

See How do I choose what information to sync on Firefox?

Connect additional devices to Sync

A device could be a mobile device (such as a smartphone or tablet), a desktop computer or another Firefox profile. For more on mobile devices, see:

To connect another desktop computer or profile, just sign in and let Sync do the rest. To sign in, you'll need the email address and password you used in the previous section.

  1. Open Firefox on the computer or profile you want to sync.
  2. Click the menu button Fx89menuButton, then click the Sign In button next to Sync and save data and sign in.
    Sign in to your Firefox Account

Disable Sync for previously synced devices

For additional information, see Sync Firefox data and Disable Firefox Sync.

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