It is great to see that you are interested in Nyxt!

There is a whole article comparing Nyxt to extensions such as Pentadactyl (Vimium, Vimari, etc). Nyxt can do way more than them.

Check it out:

https://nyxt.atlas.engineer/article/nyxt-versus-plugins.org

Also, it is already possible to have emacs and vi keybindings in Nyxt:

https://nyxt.atlas.engineer/documentation