I must warn you about one potentially unwanted program, which is called CouponDropDown. Because of this adware (sometimes it is called as a browser hijacker), your computer routine becomes messed up and interrupted by various commercials and offers. Basically, every time you open a browser, you see commercial pop-up ads and notifications that claim that you have numerous coupons to try. If you click on them, you are brought to CouponDropDown webpage presenting the offer for you. After a small research I can say that CouponDropDown affects all typical browsers, such as Safari, Google Chrome, Mozilla Firefox and others. My opinion is that all this activity is unethical and clearly used for promoting all those promotions without any permission asked.
CouponDropDown is distributed together with other programs that are always offered for free. Typically, it is included as their component and downloaded without any sign or permission asked. Once inside and active, this adware starts altering DNS settings and starts its unwanted activity. If you have also been annoyed to death by CouponDropDowns offers, you may have downloaded such programs as Online HD TV, PutLockerDownload, TornTV, Yontoo and others. In order to stop its advertisements, follow this CouponDropDown removal guide.