One reason may be tabnapping. The risk was described by Aza Raskin while he was at Mozilla. http://www.azarask.in/blog/post/a-new-type-of-phishing-attack/ http

One reason may be tabnapping. The risk was described by Aza Raskin while he was at Mozilla. http://www.azarask.in/blog/post/a-new-type-of-phishing-attack/ http://www.azarask.in/blog/post/a-new-type-of-phishing-attac...