Cool but there is a lot more that can be done to improve a browser privacy by fighting fingerprinting. I.e. provide standardized sets of data about the host system via JS APIs: only list a standard set of fonts (+ those a user consciously chooses to expose), a most common display resolution that is less or equal to the real display resolution of the machine, obfuscate canvas/webgl/cache response time etc.

Extensions API should also get optimized in a way so privacy-enchancing extensions (like Ghostery, Adblock Plus and NoScript) would work faster.

And there is a favourite extension of mine called "self destroying cookies" that currently is blocked for sending user data to remote servers unnecessarily, and potential for remote code execution - I believe it's actual functionality (not sending user data to remote servers but what it is meant for - one-click whitelisting particular domains and only keeping cookies for these while deleting cookies for others as you close them) should be built into the browser.