This addon functions well with KeePassXC (2.3) as a replacement for the old KeePassHTTP system. I recommend using this extension if you already use KeePassXC. It has a very similar interface to the old recommended addon, so shouldn't be hard to upgrade to.

I've encountered a couple of situations that made it more confusing to use than it could be – it might still be somewhat buggy – but overall it's been a good improvement, and I expect it to be further improved soon based on the rate of development of the overall project.