I don't understand your post because it's full of blanket meaningless statements. A government agency doesn't need to pay anything, they could use legal means

I don't understand your post because it's full of blanket meaningless statements. A government agency doesn't need to pay anything, they could use legal means to extract the information. I don't think there's anything stopping plug-ins from sending unique IDs. SafeBrowsing uses a cookie that makes up a unqiue ID. (The latter discussion is well documented in Mozilla's Bugzilla) But what tracking information would make your privacy toast? Privacy has levels. SafeBrowsing leaks your WAN IP to Google. (You already leak this to every site you visit) Plug-ins likely leak details about the plugin configuration (as Ghostery does). What's the value there?