“It can sometimes be difficult to tell if a web page or domain a link points to is a legit site or not. While the url of the site may give you clues at times, for example if you know it already, it is at other times not possible to determine whether it is secure to visit a site or not based solely on a link. …” Source: gHacks Tech News Details  Security Plus checks links in Firefox on Virustotal without leaving the page