I downloaded tor for linux, named "tor-browser-linux64-10.0.7_en-US.tar.xz" from its official site, which I believe is called the browser bundle. I started tor by runnning ./start-tor-browser.desktop and tor is up and running.
But I found a folder named "chrome" within the tor browser main folder. My question is why is that? Also a shell script named "firefox" can be seen too. Previously I used tor on windows, tor showed in my operating system as firefox that time. Why is that? Does tor use the already existing browser? If so, how do I change the default browser for tor?