Well, I'd say NoScript (or equivalent) and HTTPS Everywhere are rather important, too. I believe a resource blocker and HTTPS redirect could both be things built into browsers, true. But as it stands they're extensions, and pretty important ones IMHO.

And this is assuming you only use your browser for general web surfing; there are a plethora of other extensions I use that really simplify my browsing experience, but that I wouldn't consider crucial. I similarly can't live without RedditEnhancementSuite for reddit, for example. There's just so much that extensions have to offer.