[shiandow]

You mean like the tor-browser? It's not that they don't exist it's more that they're pointless if they're not used by lots of people.

Personally I'm more in favour of randomizing some of the properties. That way you don't need to rely on being unique. In the end it's all about how much information you're transmitting about your identity, and while picking a common value is one way of increasing entropy picking a random value is much more effective.