Sneaky Adware

"The two PUPs are Shell&Services and Mintcast 3.0.1. These are browser add-ons for Firefox, Chrome, and IE, and are generally installed without the user's consent, packaged with other software.
"These two come with a newer variant of the Mintcast adware, which, besides injecting ads inside the user's browser while navigating legitimate websites, also secretly turns off Safe Browsing support in Firefox. ..."
Source: Softpedia
More  Adware Sneakily Turns Off Firefox Safe Browsing