No it’s not a dinosaur. It’s a Firefox addon which I love. In fact without it I don’t do anything in Firefox. What it does is it makes Firefox behave like my favourite text editor Vim. So I can browse internet without touching the mouse. And it is much faster to use keyboard to browse internet than mouse once you get used to it. Back when I was testing and playing with all those different window managers, after I had set up awesome window manager as my primary working environment.