CaerenLoh,
The problem as most of us on this and other forums have experienced comes from a single Chrome "add on". TV for Google Chrome.
I had it - never used it. Once I removed the TV for Google Chrome add on, the problem popup's went away. FYI - In my case all of the popups were aggrevating, but "safe websites" according to Norton's.
Please let us know if this solves your problem.
Thanks, THP