No response. Surely someone knows the answer.
If Avast! is simply issuing a "do not track", then in my view this is offering little more than one gets by simply setting the "Do not track" in Firefox itself, and it is not clear how much if any protection that actually provides.
My understanding is that not all companies abide by "do not track" flags. The only secure way of handling the situation would be to block the return of any response.
It's also interesting that any changes to the default settings, for example to block by default all Web analytics, will only be retained if cookies are not cleared when Firefox is closed, and I prefer to clear all cookies when I close the browser.