If only Ladybird development had taken off sooner. The best balance of {respectful defaults, security, privacy, extensibility} out of the top 5 browsers seems to be Brave[1] for now, which isn't the most ideal situation.
the recent firefox privacy policy stuff seems way overblown to me, like you can read the firefox source code and know they aren't shipping your inputs off to google or whatever.
On the other hand, brave has provably run afoul of stealing cryptocurrency donations, and trying to trick users into adding referral codes unintentionally.
https://davidgerard.co.uk/blockchain/2020/06/06/the-brave-we...
https://news.ycombinator.com/item?id=18734999
Firefox hasn't had anything of that magnitude, has it?