[foxfluff]

And even if you could do it, it's not a given that you can make a good one.

In fact, I believe making a good browser is impossible because the web is fundamentally broken. The standards require your browser to be crap. The browser is no longer a user agent, it's a server agent, and trying to block & work around antifeatures is akin to writing an antivirus program that somehow detects and blocks malicious code without breaking the rest of the program. You can try, but it's a ridiculous never-ending cat and mouse game and if you don't keep up, you just end up "breaking the web" without actually making any part of it good.