Mastodawn

Why you shouldn't use Brave Browser

Just use Firefox.

Firefox + uBlock Origin + arkenfox user.js gives you privacy, security and anti-tracking. The only way to fly IMO.

Download uBlock Origin for Firefox. Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

Is this applicable for Firefox mobile?

According to the GitHub page the user.js is for desktop only but ublock should still work.