[RolloTom]

If you don't want edit manually user agent, oscpu and platform in "about:config" then blender can do it for you: https://addons.mozilla.org/it/firefox/addon/blender-1/

EDIT: seems that this extension need to be updated, sorry...

But I don't know, if you allow javascript maybe you will leak your real user agent?

I like to switch between iceweasel and seamonkey, and I'm "proud" of my different and unique user agent :) Speaking of privacy, actually I'm more concerned about referer, third-party sites, content delivery networks and so on.

[JoshTriplett]

> But I don't know, if you allow javascript maybe you will leak your real user agent?

The user-agent provided to JavaScript is the same one sent via HTTP.

[RolloTom]

Good to know, thank you!