Maybe good but it fails for newbies Rated 1 out of 5 stars
First of all - it is not supposed to hide every toolbars as an opt-in feature. And all replace all the usual keybindings with sth else.
Second, it should have a simple visual tutorial that can actually show users on screen both the commands being typed and response.
It maybe a Swiss Army knife for pros and uber-geeks but for me it's just an annoying addon which reverses my changes like resetting those toolbars visible all the time.
It also lacks an option of having an option or settings.
I suggest you guys to start with certain keybinding and changes that doesn't shock the user and if somebody really wants the Firefox to be replaced by Vim, give them an option to do it.