I've recently switched from chrome to firefox. Autocomplete forms has never worked for me. Firefox is either not saving, or not loading form data - I click into a form field and it jsut doesn't have an option to fill from stored data. Honestly tempted to go back to chrome at this point. I've tried following steps in help articles, settings all look ok, it just doesn't work on virtually any website. Logins are generally ok, it's mainly things like address data, email address and so on. Same on mobile and on desktop.