I was googling for "foot anatomy". An item on the first list showed the schematics of a foot. I clicked on it and got an enlarged image. After that s warning appeared: ""The page at http://stanreeva.ce.ms says: Mozilla Security has found critical process activity on your system and will perform fast scan of system files". I clicked OK, a scan was performed and lots of vulnerabilities shown. I initiated, then aborted the next step, NOT UNDERSTANDING WHAT I WAS DOING. (I recalled being told that instead of responding to such offers, I should go to the original website and look for Updates, etc, there.). I have had this iMac for more than 3 years; I NEVER had any such warning. I have no clue what it means or what I should do. Please help!