New Phishing Attack Exploits Tabbed Browsing

I think this scam exists because today I opened two tabs.  One for my Yahoo mail and the other was a banking one.  When I finished with online banking, I switched over to my Yahoo tab.  I couldn't remember if I had logged out or not, but the login page looked different.

Usually there is a padlock picture just above the login area.  This time, there was a shield picture which look unfamiliar.  The URL also looked much longer and different from usual.  Luckily, having been made aware of the scam (just today, in fact), I retyped the URL to the homepage, and proceeded to the login page - which returned back to what I expected.  This is a worrying scam, and so easy to fall prey to.