I switched from Bitwarden and I'm missing nothing.
I use it on FirefoxPortable from PortableApps.com

I only wish that it supported the portable version of KeePassXC from PortableApps.com

edit:
I could connect it to the portable KeePassXC.
Follow this guide:
- https://github.com/keepassxreboot/keepassxc-browser/wiki/Troubleshooting-guide

More info:
- https://portableapps.com/node/57907
- https://github.com/keepassxreboot/keepassxc-browser/issues/559
- https://github.com/keepassxreboot/keepassxc-browser/issues/456

edit 2: Actually, I don't think the guide really did the trick. I only changed, in the .json, keepassxc-proxy.exe to keepassxc.exe. This change was reverted automatically by the program.
Rather, the solution was to install KeePassXC on Windows (non-portable). After uninstalling this, it again doesn't work.

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

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.

There is definitely a learning curve here...

On a couple of my sites it bugs out and I have to manually copy and paste a password, but otherwise works as expected!
It usually happens on sites that split up 'entering a username' and 'entering your password' steps.

I have "key exchange was not successful" with keepass 2.4.3 on Linux Mint 18.3 Sylvia and Firefox 67.0.4. Connect button does nothing. What should I do?

P.S. I don't have this problem with 2.4.3 on Linux Mint 19.1 Tessa and Firefox 66.0.1.

On Ubuntu with stock Firefox 67.0.1, KeePassXC-Browser 1.4.6, and KeePassXC 2.4.1 I'm getting the message "You use an old version of KeePassXC.
Please download the latest version from keepassxc.org.". It does appear 2.4.2 has been released, but wasn't able to install it using neither the PPA repo nor the snap package. Would an upgrade even resolve this?

Maybe adding the function of connecting with password-generator will make it perfect.

Version 1.4.2 makes this extension great again. It lets you use KeepassXC comfortably from within your favorite browser.

Sometimes it's doesn't work, I must reinstall addon and it's work again.

with KeepasXC 2.3.4 (only this version) plug-in works as intended.
The only things missing now are:
- Ability to unlock database in the background (i.e. without opening KeePassXC
- Automatically re-scan login forms to detect / identify login fields.

== my original 1* review ==
Does not work. Every time I close my browser, I have to go though "connect" process.
Even if it did work - one has to manually open KeePassXC application and unlock database (which means, navigating away from the browser). If I'm opening KeePassXC anyway, why not copy/paste password from the application then, why use some plugin?