Whenever I open a page in Safari or Chrome an EXTRA page opens wanting me to get Mackeeper or clean my mac or opens a hotel page etc
Whenever I open a page or click on a link in Safari or Chrome, 2 pages open - the one I want and an extra one - to clean my Mac or get some game or rent a hotel room - random ads. I've tried eliminating cookies but that didn't work. Don't know how to stop this from happening.
MacBook Pro (Retina, Mid 2012), OS X Yosemite (10.10)