How to turn off coupon drop down mac, this happened
Reimage is recommended to uninstall Coupon Drop Down.
These advertisements will be shown as boxes containing various coupons that are available or as underlined keywords, which when clicked will display an advertisement that states it is brought to you by CouponDropDown. These ads are aimed to promote the installation of additional questionable content including web browser toolbars, optimization utilities and other products, all so the MacXcoupon publisher can generate pay-per-click revenue.
I even uninstalled Firefox and re-installed it and I still have the problem. MacXcoupon is an adware program, that displays pop-up ads and advertisements on web pages that you visit. I disabled Shockwave Flash and my problem went away.