Is it safe to use Brave browser on desktop?
Yep, my local library uses it on Linux, I use it on Android, and I used to use it on Windows until I started using Microsoft Edge because it has more features now (except it does not have built-in ad blocking, unfortunately, yet).
Brave Browser is free and open source like Mozilla Firefox is.
Does Bitdefender Traffic Light blocks same as Malwarebytes Browser Guard??
Malwarebytes Browser Guard is better at blocking scams, spam, PUP, adware, and other grayware type websites than Bitdefender TrafficLight in my experience and in the tests that I have seen here & on YouTube.
Does it support Vivaldi browser or Brave browser ?
Settings option not found.
I know that you can install Emsisoft Browser Security from the Chrome Web Store for Brave Browser, but I do not think that it is worth using from the times that I have used it and from the tests that I have seen here & on YouTube.
In my tests (testing it on bootleg & adult streaming video websites with lots of ads (normal, pop-ups, phishing, scam, adware, et cetera) it has not blocked much if anything compared to Malwarebytes Browser Guard, uBlock Origin, et cetera.