Solution: Click the savefrom icon and select "Settings"



Scroll to the bottom of the settings page and uncheck "Offers4U"



Done..

Savefrom.net and Offers4U appear to be affiliated. Its bundled when you install it....... I deleted SaveFrom extension on Firefox and the Offers4U adware is instantly gone... funny that? This variant of Offers4U is also particularly slippery and doesn't make itself known in the add/remove programs or extensions.. it must be loaded on the fly by the savefrom extension...