A friends Macbook Pro ( 2012) 10.10.5 has had its Internet browsers taken over by the Feed.chunkapp.com adware. When you try and search in Mozilla or Safari it redirects to Feed.chunk...and fails to open any web pages making it impossible to browse. I spent some time trying to fix it yesterday but to no avail. I followed instructions: utilities-check activity monitor for suspicious items ans did searches for the adware but couldn't find. I also looked through libraries and applications but no luck. I also installed Malwarebytes and scanned but couldnt resolve the issue.