It's not 100% perfect, e.g. no Chrome version, a few bugs here and there, but all in all this seems fantastic. Nothing else seems to encapsulate this functionality (except Tor Browser), which is really a shame. The referer header is a significant source of information leakage which has been around since the web was invented. I'm surprised that this extension is perhaps the only way to defend against such leakage with ease. It certainly brings a greater peace of mind with respect to people being able to track your movements.