When you click on a hyperlink, Firefox and Chrome both check it against a list to see if the domain has been reported as a phishing site or a site containing malware. Where does that list come from? Do Firefox and Chrome (and maybe others) use the same list? Who manages it?
Firefox and Chrome use Google's Safe Browsing utility, which is managed by Google, as the name implies. They have a transparency report with statistics viewable at: http://www.google.com/transparencyreport/safebrowsing/