Great for Emacs Users Rated 4 out of 5 stars
This is a great extension for people whose fingers are tuned to Emacs. You can actually change many key-bindings to whatever you want, but the defaults are set to the Emacs ones. I love it!
The biggest issue is that the extension traps the Escape key, which has other uses in Firefox. Thankfully, a forthcoming version of the extension allows you to disable this.