Well, having made no special effort, the site claims my User-Agent is as unique as my set of 5,150 installed fonts. To be fair, I suppose WebKit nightly version

Well, having made no special effort, the site claims my User-Agent is as unique as my set of 5,150 installed fonts. To be fair, I suppose WebKit nightly version numbers don't satisfy most definitions of "random". As for mechanisms, to what end, if nobody bothers to use them? Especially things like "randomize User-Agent string" that'd break a great many "non-evil" sites?