Malware on a Mac!
I was careless while installing some freeware on my MacBook Air. It was a video player called MPlayerX. While installing I failed to uncheck the box that says “Install Blah Blah Blah Search Bar”.
It infested Safari, Chrome and Firefox with pop ups and bogus ads.
It showed up in the add ons/extensions for all three browsers but using the standard removal process didn’t fix the problem in Chrome or Safari. It did seem to work in Firefox.
So I installed an antivirus program called ClamXav. It is scanning now as I write this.
ClamXav found something called VSearchAgent.app.