Das Add-On tut was es soll und das sehr gut.
Doch nur, wenn NoScript deaktiviert ist :-(

I see now its a prerelease. since being installed it gives the pop-up notice to sign in to use auto fill on the sites it recognizes I have stored passwords on. But if you sign in it doesn't load. Just says verifying Password like its loading but goes no further.
Hope this helps. Windows 8.1 Firefox 48.0