I have tried most of the other password managers, and I like Keeper the best for Windows (Firefox) and iPad (Safari).

However, there is one glaring issue: if you are using 2FA, Keeper requires the 2FA code for every sign-on to Keeper. The extension also will not remember the user's email address. This may have something to do with my settings; I'm using the tracking protection and also clearing cache/cookies on exit from Firefox. I would still expect Keeper to handle this without requiring the 2FA code each time. The Chrome version of this extension handles 2FA just fine, and I'm running incognito with Chrome.