Comment 40 for bug 176125

> Even if it is off by default on every operating system, some users are
> invariable going to enable it, and you need to deal with them anyway.

This is exactly the point!

Ron, Derek, I can understand your headache with the privacy extensions in your scenarios. But you problems are not solved by the answer of whether to set the default to on or off.

I simply cannot and do not want to understand why one would give out his / her MAC address on the largest public network - the internet. It tells everyone if you are browsing via WiFi or Ethernet, others can track you as a person, know when you changed your network interface and with some devices (where you can't change the network interface) know what device you are using. That's simply bad and so the privacy extensions should be enabled by default.