I think it's the opposite: NAT almost made IPv6 obsolete. I spent a large time trapped behind a NAT by my former ISP, getting "you are alredy downloading" errors. So I absolutely hate whoever invented that crap.
Chrome and Flash are installing services, but they also create tasks in Task Scheduler. Will Firefox do this as well? Can one delete the services and have only the tasks running?
EDIT: someone in this topic linked to prefixfree, which is what I asked for, except it's not browser-native.