You're asking for a completely new browser engine to be written. A browser with a completely new browser engine isn't going to be "good" for a long time, becaus

You're asking for a completely new browser engine to be written. A browser with a completely new browser engine isn't going to be "good" for a long time, because most webpages will just be broken on it, until they've managed to implement some portion of the webstandards in a semi-decent way. The upfront-investment is ridiculous. Which is also why no one's done it since last millenium. There's only one project, that I'm aware of, that's semi-seriously trying to write a new browser engine: Mozilla is working on a completely new browser engine, called Servo, and they've been working on that since 2013 and it's still miles away from actually being usable for every-day-browsing. It is good in other ways, really good performance and security, but if you prefer Pale Moon over Firefox, that's probably not even what you're looking for either. Officially, it's a research project, some components from it have just recently been included into Firefox, and yeah, it's not even necessarily going to be turned into a complete browser. Mr. pcwalton (who also replied to you) is one of the core-devs on Servo, so if you have questions about Servo, he's probably more qualified to answer those than I am.