https://qutebrowser.org/ and Librewolf
https://qutebrowser.org/ and Librewolf
You can, but the last time I did that the instructions were incomplete, and you still had to auth through Mozilla. That was a few years ago, so things might have changed since then.
If you liked vimperator, you might like https://qutebrowser.org/
Install Ganeti, or K3s, and do a lot of things!