I dont really understand what the big deal is about the UI. Its a web browser, to me the UI doesnt matter because Im not using it but 1% of the time. The only part of the UI I actually use in a browser is the address bar and favorites bar. Aside from those 2 things its not like Im sitting here playing with the web browser itself. I think its stupid to compare them that way. I would compare them based on speed and security. And even on that measure, it depends more on the computer than the browser. A browser is a browser to me. Except IE. IE is horrible. Mostly because its Microsoft
If you use anything in a program, you're using its UI. Doesn't matter what you do.
You can also view web browsers as programs who render UIs of websites on the Internet. Some of them render them better than others. Some do fairly well but also make it easier to do important things, while others let you go crazy with the browser's UI while sacrificing speed and ease of use. And others just suck at doing anything in general, namely IE before IE11.
As for speed and computer dependency, I've had better results with Chrome on a lot more computers than I've had with Firefox on those computers.
So in the end, it is up to your perception, and you can definitely be proud of the fact you think you don't conform to what other people think you should conform to, and that's fine.
Doesn't mean you won't get criticized for it though.