Ref Browsers: My brother uses nearly all of the common browsers because of varying compatibility with sites that he visits: Firefox, Chrome, Opera, IE11, maybe Safari in there somewhere. For my usage, I also observe odd incompatibilities and use primarily the first 3 and set all of them to delete history, if I am not already in an 'incognito' or 'private' mode as well as being inside of a Sandbox (Sandboxie).
However, MS has given plenty of warning that browsers are not the future: Apps with a designated purpose are => similar to apps as found for Android and iOS. A closer look at how my ChromeOS operates already shows that future by how it uses the Chrome browser for relatively unconventional activities. and per Google, many Android apps are supposed to be ported to the ChromeOS. I do not have any Apple device anymore, but I hear similar stories about comparable operations between an iPhone and iPad and Safari.
As for MAC ID usage: an acquaintance lives near the Washington Beltway (Beltway Bandit). per his comments, there is a roadway nearby that measures the average speed of a vehicle based on any MAC IDs picked up from that vehicle at two different points. If the vehicle speed is too fast, the traffic lights ahead go on red longer. Therefore he keeps his WiFi on his iPAD and iPhone OFF unless being used! For that matter, many of the traffic monitoring businesses use the MAC ID from passing cars to determine traffic speeds, not just cameras and road surface sensors. Even a casual glance at any news-media traffic monitoring site or any Maps program (eg:Google Maps) with the traffic flow enabled should notice the surprising coverage they offer. There are simply not that many sensors in the road surfaces or cameras in all of the locations to give the detailed flow info. All of the drivers are not using WAZE or Google Maps with their GPS enabled. Near Nashville, I observed nearly minute-by-minute changes in the Google-recommended route that I should take to bypass the traffic jams going past downtown Nashville.
Back to the basics: We all carry around portable radios in our pockets. Turn off any transmissions not needed! The benefit is prolonged run-time on batteries.
Back to the original topic: No one in my extended family is switching to Win 10 any time soon, over 18 people. The more computer astute of them, typically the grown sons, have stated that they will wait to see what MS kicks out in the first Service Pack release, or whatever/however MS designates it..