jffryclough, Firefox now has it's own autofill program.
Google - Firefox autofill - and you'll find various web sites that'll give you instructions. I believe you open Firefox, then scroll down and click on settings. Next, scroll down to advanced settings and click on it. Once on the advanced settings page you turn on the toggle for "save form entries". I believe Firefox will then remember the information you've typed in the various fields and fill it in for you on your next visit.
I can't get Firefox to work with ST. Frequently, it won't even allow me to sign in to the site. I use several sweep sites and I only have trouble with Firefox on ST.
I'm using the Edge Browser with an older version of Roboform for ST. The Edge Browser also has a Autoill feature named- - AutoComplete. Once again, Google it for info & instructions. I understand that Dashlane and Last Pass both now have autofill prorgams that work with the Edge Browser.
"Only those who will risk going too far can possibly find out how far one can go."
T. S. Eliot