Microsoft has integrated Bing Rewards into the Bing header for easy and quick access to earning credits and redeeming rewards. Bing Rewards is now available to users on Internet Explorer 7 or later and the latest versions of Firefox, Chrome, and Safari browsers. By expanding the ways to participate in Bing Rewards new members are no longer limited to using IE and the Bing Bar. Existing members can now sign in to Bing to continue earning credits when they are on a computer without the Bing Bar installed.

Full read: Bing A new way to earn with Bing Rewards - Search Blog - Site Blogs - Bing Community