Firefox's protection against fingerprinting
Stuff like this is why I hope Firefox remains viable as a browser long term.  Chrome is now what? 80% of the browser market share and they have no incentive to protect user privacy.I'm really worried that we're going to head down the road of chrome becoming the only browser anyone tests their site against and we're going to go back to the bad old days of IE 6 compatible sites that are completely broken in other browsers.