Introduced at Toorcon, the Firefox extension allows attackers to capture site cookies from users on unsecured wireless networks and browse under their logon. Bing is looking into SSL and other privacy settings for the next version of their search engine. Currently the site strips SSL when forced into HTTPS and in turn, brings up an advisory on browsers signaling an unsafe connection. If sites like Bing don t implement SSL into sites, the lack of full-end encryption will still be a problem.
Source: https://threatpost.com/combat-firesheep-microsoft-s-bing-looking-ssl-102910/74624/