I used to have the firestick 4K but since I went to nvidia shield it has been money well spent and can watch in 4 k with no buffering whatsoever. I also use my I pad when out and about to watch live sport with my cellular connection at £16 a month unlimited but not as good as a hard wired wi fi.Good if you are in a caravan with no Wi-Fi available and out and about.
I never open any links on my computer if I do not know who it is off .It might contain or have a virus or a Trojan or even a ninja turtle lol Normally use total virus and scan it before I open it to be on the safe side.