As all Android users may know, some websites will forward or pop up a Play Store link, and AUTOMATICALLY (without clicking anything at all, only by being on that site!!!), you will have Play Store window opened with the advertised app in question.
Better would be, either a warning screen (where the back button should be enough to cancel the request), or if you didn't click on a Play Store app link (so if it was redirected from a website, for example, through javascript), ignore it TOTALLY.
Have the Play Store windows only open if you REALLY clicked on an official Play Store link (or maybe even then, only after a YES/NO prompt).