Mozilla is an absolute joke of an organization, and it's tragic that they are still the primary alternative to Google having a total monopoly on browsers. I suppose you shouldn't expect much from a company that is just there to maintain a facade to fend off regulators.
We're at a really dangerous point with browsers at the moment where there's really no consumer-friendly option available.
I'm scared to say that Safari comes closest but you're just in Apple's walled garden then instead of someone elses'.
Our only hope seems to lie with Ladybird, if that even ends up being good and it seems extensions aren't on the agenda at least for a while.