[catamorphismic]

Search for Tridactyl, which is aiming to reimplement the Vimperator/Pentadactyl feature set in WebExtensions Firefox. It's still in early stages of development but there is already an initial release on AMO with some basic features implemented and with a very familiar feel.

[iterati]

I've tried Tridactyl, but the plugin not working on Firefox pages is the same frustration I had with vim plugins for Chrome.