[dvfjsdhgfv]

Practically speaking, you would have to use Chromium as a base, if you want the product to be successful. And if you do that, Google has a million ways to screw you up. One of the first obstacles you will find will be Widevine. Hardly anyone moves past that point.

[ehnto]

Not sure why you got downvoted. Practically speaking, A fully fledged and compliant modern browser would require a team to build if not built off the back of another browser. So either you're a funded non-profit or you need to make money which doesn't seem compatible with privacy on the internet.

[S4M]

Why not use Firefox as a base?