he internet is in desperate need of an alternative to the Chrome/Mozilla/Safari trio.
No it's not. You have lots and lots of different browsers. Do we need another browser engine? Also not. They all do the same thing so while it's good to have some competition we definitely don't need yet another one.
Ok, so what do you want your 4th, new browser to do differently? What's so different about it that you can't build it on top of Gecko?