This needs to be expanded and added to baseline firefox. 10/10. never wanna go without it again.

Vim in the browser. Yes.

Exactly what I was looking for. Very feature complete, very easy to get into, very well documented (yay :help!)
Kudos to the tridactyl authors! :)

After learning vim, I stumbled into this Gem. Feel like I have wasted years of my life by using a mouse. Awesome plugin!!!

I do not know how to live without it! This is the first add-on I install on any Firefox instance I work with. Great Vi/Vim like keyboard navigation and shortcuts which are missing from the Standard Firefox... These functionalities are what any proficient user needs.

Saves a lot of time
Great extension.

Some minor problems :
Some keybindings are missing though, like opening/closing sidepane and full integration of navigation with containers.
Copying a block of text sometimes copies all the text in one line, this is a bit annoying when copying a code snippet with particular tabs and lines organization.

The best vimperator's replacement for FF63+

It's not perfect, but it's damn good and getting better all the time. 5 stars for recreating so much of the Vimperator experience, for the thoughtful workarounds on the constraints imposed by the new Firefox APIs and for the continual improvement.

Wow, this is a huge productivity boost for me!