I mistyped the url thesaurus.com as theasurus.com and up popped a screen that looked very much like a Norton screen. The url was redirected to http:// warning .topsupporta.com/index-15mac.html?isp=AT&T+U-verse=&browser=Firefox&browserversion={browserversion}&ip={ip}&os=Mac&osversion=10.10&sxid=125prw257514
The message was that I had all kinds of spyware and viruses and needed to call an 888 number. The number is not one of the Norton numbers. I did a full system scan and nothing was found. Looks like this is a softer version of the ransomware sites.