Malwarebytes Anti-Malware for Mac is a free app that will scan for and remove adware. The original v1.0 release was just a re-branded copy of Adware Medic (purchased by Malwarebytes in July 2015), and the recent v1.1 update has been “rewritten from scratch”. Important to note: Malwarebytes Anti-Malware for Mac v1.1 drops support for OS X 10.7, and is now only compatible with OS X 10.8-10.11.