An amazing open-source password manager solution that I switched to from LastPass and haven't looked back. It's blazing fast, easy to use, has most features that the big boys have, and far less buggy than LastPass has been for me in the past years.

The development team is frequently pushing out updates and the add-on is very solid now compared to where it was 6 months ago.

There's a couple of annoyances still, but many of those are due to the limitations of Firefox itself.