The article mentions the difficulty of preserving or changing the privacy settings in Windows.

Ironically if you want to prevent Firefox to "phone home", you will have performs many obscure tasks:

https://www.mozilla.org/en-US/privacy/firefox/

Some of those require changing the internals of Firefox: about:config.

I wish Firefox would just have a big red button, Disable All, instead or requiring me to preform all the tasks listed in the link, when I install Firefox. Or even better, make those choices opt-in, instead of opt-out.