I think hardening Firefox with about:config is the best option, as using an extension with a small user base like JShelter or any other unpopular extension just makes you stand out in its own way.
I don't like Brave because it's not customizable; everyone's Brave browser looks and acts the same. That's not good, in my opinion. I prefer Vivaldi if I want anything Chrome-based.
I think hardening Firefox with about:config is the best option, as using an extension with a small user base like JShelter or any other unpopular extension just makes you stand out in its own way.
If you are new to this I'd recommend you to try LibreWolf which is a fork of Firefox with hardened privacy settings and additional privacy enhancing tools preinstalled. If you just want to stick to the real Firefox you can try this: How to Set Up Firefox for Privacy | avoidthehack!
But I really advise against it if you don't know much about this topic as some about:config settings might stop websites to function properly or might cause weird behaviours.
If you are new to this I'd recommend you to try LibreWolf which is a fork of Firefox with hardened privacy settings and additional privacy enhancing tools preinstalled. If you just want to stick to the real Firefox you can try this: How to Set Up Firefox for Privacy | avoidthehack!
But I really advise against it if you don't know much about this topic as some about:config settings might stop websites to function properly or might cause weird behaviours.