A different question rather than “what is the best internet browser for privacy?” is … given a choice of internet browser, what are the best settings and most appropriate extensions for privacy? There is no simple answer to that because there are so many (confusing) settings. A good browser choice therefore is one that is more private and more secure out-of-the-box.
Another question is “what sites should I simply avoid if I care about privacy?”
Almost all privacy / security mechanisms that you might enable also might break a given web site. So whatever web browser or extension functionality you use, it must allow you to make exceptions for sites where your desire to use the site outweighs your lack of trust.
A different approach is not “what is the best internet browser for privacy?” but instead … using as many web browsers as possible in order to keep browsing with one browser separate from browsing with another browser. This for example may confound “fingerprinting”, should keep cookies separate, may mitigate browser exploits that escape out of one page.
If you use Firefox then you should consider enabling the “resist fingerprinting” option.
This is true - but given that this is the model, people should think twice before just blocking ads. Blocking ads is not in and of itself enhancing your privacy - although the process by which the choice of ad arose almost certainly did compromise your privacy.
With the understanding that it is just an advisory to the web site and very likely is ignored by just about all web sites.
Perhaps the government could give “Do Not Track” legal authority. It’s the sort of thing that might happen in Europe, but not here, where the government is part of the problem, not part of the solution.