“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. …”
More Adware Sneakily Turns Off Firefox Safe Browsing