Used it satisfactorily since first version of FF Quantum up to last FF update (64.0). Since that update I have a very strange behaviour on some sites. E. g. outlook.office.com: the E-Mail-Popup window is completely empty, misses the whole form. Needs to deactivate password toggler to see the page content.

Seems to work but not when a website brings out another site on top of the webpage to input my password but sites like google and facebook works well.