The only “paid” browser I know of is arguably Internet Explorer, but it’s bundled with the operating system.
Open-source is a great movement in computing. It may never take over the Microsoft/Apple majority, but the fact that if you’re willing to learn and teach yourself how to do it, you can make amazingly robust and secure computers and networks without paying for any of it.
Also, Firefox is freeware and it’s generally regarded to be much better than IE. Foobar2000 is a free music player that will play pretty much any type of audio file and has so many options that you can change yourself. VLC is one of the best video players.
Feel free to spend as much money as you want on software, but to disdain freeware or open-source is limiting yourself severely.
There is freeware that is full of malware, to be sure. You can’t just go installing any old thing. But if you do a little research, you can find ways of doing pretty much anything on a computer that aren’t malware-ridden or that won’t bleed your wallet dry.
And the last time I checked, I paid for my OS.
Now then, you are prepared to assert that the people at Mozilla do what they do because they're charitable and live off trust funds?