AdwareMedic is now Malwayrebytes for Mac. Still free, still great.
Try
Malwarebytes for Mac next time you think you have adware. It's super fast and free. I noticed it won't find ZipCloud, which will jack you up, too. Don't use MacKeeper, either.
If you get 'locked up', force quit Safari, then launch it while holding the shift key, and that should free you up. Then go to Safari Preferences, delete any extensions you don't know, remove website data until it's clean, and download Malwarebytes for Mac. If that doesn't find anything (or even if it does), keep cleaning the following:
Click Finder, on top of screen, click Go, then hold Option key and select the Library folder.
- Get rid of unknown items in LaunchAgents
- Delete com.apple.Safari.SavedState folder
- While you're in here, might as well delete all files in Caches folder, which most people have full of crap.
Go to Mac HD > Library and delete unknown items in:
- LaunchAgents
- LaunchDaemons
- StartUpItems
Go to System Preferences > Users & Groups > Login Items
- Highlight any items you don't know or don't want to auto launch, and click '-' (minus) button. If they say (All users), you'll need to unlock the lock first.
Now, restart Mac and first thing after login, delete trash.
Test Safari... no more popups or adware.