I quote to this support document at Mozilla.org
Turn autofill on or off
- Click the menu button Menu and choose Preferences.
- Click the Privacy & Security panel.
- In the Forms & Passwords section, put a check mark next to Autofill addresses to turn it on, or remove the check mark to turn it off.
I have a Privacy & Security panel but no Forms & Passwords section nor an Autofill option.
This is an updated version of Firefox on an updated version of MacOS.
Where are these options? Searching for them using the preferences search returns nothing.
Best Answer
No option to save address, credit card and other details
This is a new feature and may not be rolled out in your version of FireFox:
Source Firefox/Features/Form Autofill - MozillaWiki
Wasn't this available in older versions of Firefox, a decade or more ago!?
Not as far as I know. However, there were add-ons that autofilled forms.