[nextos]

Vimperator / Pentadactyl gave a fantastic experience on Firefox. But the recent transition to WebExtensions killed them, which is really sad.

It's the only major regression I have ever experienced in my computing workflow. There's no good replacement, as browsers that provide a good keyboard-driven experience come with their own troubles as you explained.

[alexherbo2]

Tridactyl is currently the best (Vimperator / Pentadactyl)-like extension around. It seems to be nicely done and is in TypeScript (and Python for the application (native messaging) part). You might want to give a try, if not already.

https://github.com/tridactyl/tridactyl