I've liked Firefox in the past on school computers, but lately I've been using brave on all my devices.
I love Brave, with its built in adblockers PLUS the ability to install more on top of it, so you can turn one off and still have protection. It feels pretty streamlined.
As someone who pirates stuff pretty frequently too, all of its pop up blockers make me feel more safe.
Should I make a switch to Firefox, and if so, why?
Also, what you are calling "streamlined" is what I call loss of user control. You no longer have control of your content blocker, Brave does. And they've shown they'll allow content through for those who are willing to pay them. Also, I don't know if they still do it, but I remember they used to inject their own advertisements on websites (I think it was opt-out though). Honestly, Brave has done a lot of sketchy untrustworthy crap over the years and it boggles my mind that they're still so trusted by supposedly privacy and security minded people.
Finally, as others have already said, their browser is based upon the Chromium codebase that is controlled by Google and will be affected by their Manifest V3 changes.
And they’ve shown they’ll allow content through for those who are willing to pay them. Also, I don’t know if they still do it, but I remember they used to inject their own advertisements on websites (I think it was opt-out though)
You sure you're not thinking of AdBlockPlus, or did Brave do it too?