How do I remove macshop ads?
I have a macbook pro 13 in retina (the 256 gb one), and this morning a bunch of ads started popping up that all say "ads by macshop". It also turns random words into hyperlinks to various websites. Last night I tried setting up a VPN through vpnbook.com (their USA pptp one) and I think that has to be where it came from. After using both Bitdefender virus scanner and ClamXav (both from the app store), I have found nothing. I also updated to osx 10.9.5, because it was available, and I thought it might help. What makes it more confusing is that I have two google chrome "users". One of them I use for school and is linked to my school email address and the other is not. The ads only appear on my school user, and in firefox (which I almost never use), but not safari or my other chrome user. Now I need to figure out how to remove macshop, and I am also worried about other malware that I cannot see. Thanks.
MacBook Pro with Retina display, OS X Mavericks (10.9.5)