For legacy saved form data you can look here: *Settings -> Privacy & Security<br>Firefox will: "Use custom settings for history": "Remember search and form history" *https://support.mozilla.org/en-US/kb/control-whether-firefox-automatically-fills-forms If you do not see the "Forms and Autofill" section in Settings then try to set the relevant prefs to 'on' if they currently are set to 'detect' on the <b>about:config</b> page. *Settings -> Privacy & Security -> Forms and Autofill *https://support.mozilla.org/en-US/kb/automatically-fill-your-address-web-forms *https://support.mozilla.org/en-US/kb/credit-card-autofill ----- *https://support.mozilla.org/en-US/kb/about-config-editor-firefox *https://support.mozilla.org/en-US/kb/firefox-options-preferences-and-settings