Disable credit card and payment method syncing across devices

Firefox Sync lets you access data such as bookmarks, history, logins and passwords, and credit cards or payment methods on other devices when you are signed in with your Mozilla account. To disable sync for sensitive data like credit cardspayment methods to prevent purchases on a shared device, follow the steps below:

1. In the Menu bar at the top of the screen, click Firefox and select Settings (or Preferences, in some cases).Click the menu button and select Settings.
2. Click SyncAccount and sync in the options to the left.
   • In these settings, you can choose what items to sync across devices when you signed in with your Mozilla account.
3. If syncing is ON, then you're syncing the items that appear in the panel.
4. Click Change… to open the Choose What To Sync dialogManage sync data.
5. Uncheck the box next to Credit cardsPayment methods to stop syncing this data across devices.

   

6. Click Save Changes.

Additionally, you can disable payment methods autofill to prevent Firefox from filling in your credit card information on the device where this data is saved.