Horribly unreliable. Two stars because it isn't completely broken.

I flush cookies on quit, so I sign into the same sites over and over. I *know* the URLs are right. I know it *can* find the right login form fields for these sites. It has succeeded in the past, so everything must be in place to work right. It just often doesn't fill them in. And it's not just one symptom, it's a strange mix of scenarios and reassuring feedback right before it does nothing. I love keepass, and want to love the extension, but I'm off to write a few github issues.

The plug-in working for me perfectly. all you need to do, is to enter the correct URL. Thank you!!

Works pretty good... on occasion you may have a funky website that you may have to hunt down a reliable login address for... for what it is it works great with a minimal amount of fuss.

The login/password is almost never auto-filled by this extension in websites login/password fields. It works only on a very few sites (like Paypal for example).
I tried with the snap version, and the ppa version of KeepassXC, I got the latest version of it, ran the script when needed, nothing worked.

Keepass2 with Kee extension works perfectly on every webpage, so I went back to it. Shame because the installation of keepass2 with mono on linux is a pain, compared to the simple snap install of KeepassXC.

Definitely a little buggy, unlike the main app. Once had an issue where the banner for updating an entry showed up despite the credentials not differing, the banner failed to appear on the next page despite being set to appear after infinite redirects, then on my next login on a different website I was notified that my database had changed despite me not interacting with the banner or database, I said to discard changes, after which the main app froze. Restarting the app usually fixes things, and when the extension works it works well.

I've been using this plugin with both KeePassXC and KeePass (via a fork of the natmsg agent) and it works great. Occasionally loses connectivity, but that's usually only after I've had the program up for weeks and due to high load on my workstation which causes. If that happens to you just restart the natmsg processes and all is well again!

Was a little bit difficult to understand how to use it for Mozilla account:
Find it in https://support.mozilla.org/en-US/questions/1276862:
Create a Keepass entry for Firefox and highlight it in the list
From the menu bar select [Entries->TOTP->Set up TOTP...]
Display the QR code in the FF set up web page and copy to the [Secret Key:] field from above.
Accept defaults and press [OK]
From the menu bar select [Entries->TOTP->Show TOTP..].
copy this number into the response field in the FF set up web page

It should now be all set up.
To use highlight the entry and select [Entries->TOTP->Show TOTP... ](or copy TOTP... if easier)