So just to remain anonymous people prefer to use TOR but honestly, I don't think TOR is enough, and secondly, we face a lot of problems while using BTT on TOR. I lastly read a topic about TOR in which people were facing issues using TOR. And after reading that thread I got to know the importance of TOR and gave it a try but on my side, the Captcha loop started. (I think the topic from which I was motivated was also facing the same issue, Actually, I tried TOR after some time of reading that thread).
Tor browser completely hide your IP and your data will be secured. Most of people using Tor browser to secure data from the reach of government. Tor has special type of Onion router, enough to hide online activity.
OP wanted to use Tor browser because we are talking about payment and cryptocurrency in this forum and very risky to use without tor in countries where crypto is restricted. I faced captcha problem by using free VPN also. I haven't used Bitcointalk in Tor browser because its slower than normal browser.