Adblockers are a necessity to bring a computer up to the minimum level of security your friends and family need. There is so much malware being served through ads nowadays I wouldn't use any computer and try not to use a phone without adblockers in place
Android phone users may find it useful to know that Firefox for Android works great with uBlock Origin. No more app store popups, audio ads, or sucking down your mobile data.
It's very useful, but I try to encourage everyone I can to root and install a system level adblocker. Not feasible for 100% of people but the more the better.
