A good add-on that works well. Unfortunately, it does not work with Firefox when Firefox is installed as a Snap package.

good stuff

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!