I do NOT use Chrome, or anything Google. They are the "Tracking Champion"! I found AdBlock on OSX 10.11 works fine. BUT blocking sites requires you to double click on the site to add it to "Blocked" list. I mostly use FireFox, but Safari is pretty good also. I have the 5/50gb plan, sometimes have run low last week of month. Never ran out yet. Speed varies so much. "Activity Montor" shows varying speeds, but 6mb takes only a few seconds. Currently showing less than 100 bytes/sec.! Larger sending speed goes way up.