I might have mentioned before the Glide browser. If not, it's keyboard driven browser on top of mainline #firefox.
My main complaint about Mozilla in the past 10 years has been their move to the web-extensions API and in the process dropping support for the greatest addon of all time: #vimperator.
Glide comes very close to its functionality, and even though at the moment is still lacking important features (or I'm unable to program them to my desire), I can mostly make it work for my purposes, which feels great.