I had some initial trouble getting this to work with my Firejail configuration, but that's not terribly surprising. It's connecting over STDIN rather than HTTP, and an overzealous sandbox is going to have some trouble with that. I think part of the problem might have been that I was blocking the /tmp directory where the KeePassXC socket lives, so if anyone is having the same niche issue, try unblocking that.

Anyway, my several minutes of sandbox fumbling aside, this has been a great successor to PassIFox and KeePassHTTP-Connector so far. I love that KeePassXC now has a "match URL scheme" option, so I would have passwords filled on say, "https://google.com" and not "http://google.com", and I appreciate that it doesn't autofill by default and tends to require me to click a bit in the username field first, unless I configure it otherwise. It's an ideal balance between convenience and security. I hope to see this add-on carry on for years.

Works amazingly well. Previous comments with one star rating are obviously not following the documentation and installing the beta version of the client. I think it is time to say bye bye to Lastpass!

Testing on ArchLinux, with FFox 57.

Doesn't connect to KEEPASSXC database:

KeePassXC-Browser has encountered an error:

Timeout or not connected to KeePassXC

Does not connect to KeepassXC at all. Tried as much as possible, confirmed KeepassXC has an open port running on 19455. Added local port rules for it, and even completely disabled firewall (TinyWall) but this Firefox extension does not see it. The only error status it shows is " Timeout or not connected to KeePassXC ".

The only documentation is found on the github page, but nothing on troubleshooting to find out what's wrong.

Excellent!