I've been using this add-on for bitwarden in Firefox along with bitwarden free for about nine months now and it works very well to allow me to use unique complicated passwords. I've been gradually changing the passwords for everything I log into and I can get them filled in quickly and easily using the add-in. I've had Firefox as my default browser always and it rarely needs me to retype my master password. That just changed when I temporarily switched to a different default browser(for other reasons) but I'll be switching back to Firefox as default soon. Bitwarden is available on my android phone as well but it's more clunky as I haven't mastered that and don't use it much there. I'm sure I could make better use of it on the phone but I don't really need it there.

In conclusion, bitwarden free is great when used with its Firefox add-on.