@oldschool: Not funny. I use the best user.js for Firefox a long time: the ghacks user.js and you break website features and even websites itself with some configs.
Many even make you more unique in fingerprint
You are correct, my firend. It's funny because I broke FF last time I used it. My original question to @South Park was simply to find out what his tweaks were. I generally believe in the "low entropy is better" theory but @blackice is correct that privacy efforts have their limits. I like simple, easy, built-in features. And un-broken! It's why I use Brave.