Home of the Firefox/SeaMonkey add-on: Form History Control
How can I install the pre-release version?
To install the latest pre-release version goto the add-ons page https://addons.mozilla.org/firefox/addon/form-history-control/ and select development channel (located at the the bottom). There you find a button to install the latest development version.
Thanks! That worked. Switched to FF only yesterday, still learning.