It works great. It was disabled a few days ago maybe because the required permissions changed and Firefox disabled it, so it wasn't really a Bitwarden fault, but a Firefox one (for not warning about it and simply removing it).
The extension is quite good and reliable, but not always detects when I sign in a new site and not always detects when I'm changing the password on a site I already use. It makes the experience on that pages a bit tricky because you have to be cautious and manually update the saved password or you will lose access to the site.