Win. 8/64 bit

Google is my browser, but do i want google's plug=in's ...i..e. Native Client and or PDFVIEWER ? advantages/disadvantages ? also any idea how to stop annoying ad popups that i have to 'x'-to close or the auto-runs at same time i'm on a site ? have disabled flash-player also..thanks in advance ALSO: i get popup notices to update Adobe Flash but thought Google updates that automatically - inotherwords are these popup ''updates' required ''legit'' ? ..edythe