Firefox lets you automatically fill in your address on forms (for example, when you're ordering something online). Follow these steps to manage this feature.

Turn address autofill on or off

1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.
2. Click the Privacy & Security panel and scroll down to the Forms and Autofill section.
3. Put a check mark in the box next to Autofill addresses to turn it on, or remove the check mark to turn it off.

Edit your saved addresses

Use this setting to add, remove or change saved addresses in Firefox.

1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings.
2. Click the Privacy & Security panel and scroll down to the Forms and Autofill section.
3. Click the Saved Addresses… button.
4. Choose one of the following:
   • Add…: Enter a new address using this button.
   • Edit…: Select the address you want to change, then click Edit to change it.
   • Remove: Select the address you want to delete, then click Remove.
5. Click the ✕ to save your changes and close the window.