I've used this extension for sometime and like it. However, lately I'm prompted to update KeePassXC to 2.5. Using Linux Mint 19.2 this has to be a flatpak or snap repo. Non-bueno. Have to add a script for the snap repo version as it is sandboxed. Muy mal(not sandboxing, just the other stuff).
So my mild aggravation is that I'm unable to set the update preference to never and have it stick. On the positive side it adds a nifty little four-pint lime green star to the extension icon. Kinda like it actually
I know, a bit nit-picky but I is what I is. Thanks for the wonderful extension to go with the fabulous password manager. Peace, love and Linux.

In combination with keepassxc + keepassxc-cli I am now a real happy camper ;-). keepassxc-cli solved the only problem which was left: How to merge databases from different devices. Great!

Now has even 2step login support!
Only missing piece is updated TOTP retrieval as mentioned in irc.

It's not working on Firefox

After a September 2019 update, the add-in would no longer connect to the KeepassXC database, rendering it completely useless. Error message is: "Cannot decrypt message"

However, as promised by the developer, an update was rolled out and it's working again. Thank you!

Not working for me on Linux Firefox 68. Plugin doesn't fetch or updates passwords. Won't connect to my database. Absolutely no trust in this app!

5.2 Kali, works perfectly. Thanx!

An absolute must. I don't even know how I have survived for years without this extension. Furthermore, every new release seems to be better than the previous one, and this is good™.

For the most part, this functions ok and I'm able to use it. Unfortunately, for some sites (such as https://cards.barclaycardus.com/) it just doesn't seem to detect the un/pw fields even after I manually select them. Barclay's site is particularly strange. When I "choose custom login fields" I get two of the "overlays" for choosing fields. I have issues on Community America Credit Union's site as well, which might have something to do with the fact that the login form "pops open" when you click in the username field. I haven't really had any issues connecting to my KP database, mostly just issues with the auto-fill/field detection. Thanks for the all the hard work though, I appreciate it. I'm sure over time these kinks will get ironed out.
EDIT: PopOS! 18.04 (so ubuntu 18.04) & Firefox 69.0.1

It works well. And it's free software solution. Thanks a lot. Good bye proprietary pasword managers (e.g. LastPass :-)

Not working for me on Linux Firefox 68. Plugin doesn't fetch or updates passwords. Works in Chromium.