Awesome project! But just a heads up, some users are going to be concerned that you aren't open sourcing it just for the fact that extensions basically invade your privacy and can see what you're looking at, what you're typing, passwords you enter, where you are logging into, and more. Just a whole lot of alarming stuff is all. None-the-less, cool project, I would just personally have to view the code before ever installing a 3rd party extension.