Although Bing is provided as one of the Search option in Firefox but now Microsoft teaming with Mozilla brings Firefox with Bing, browser that includes default search settings for Bing. Thus making easier to use Bing in Firefox eliminating extra steps to configure.
Firefox with Bing offers the latest version of Firefox with Bing set as your home page and the default setting in the search box and AwesomeBar (where you can also type in queries as well as Web addresses). If you already have the latest version of Firefox, then you just need to download the Bing Search for Firefox Add-on to set the same preferences.
You can download Firefox with Bing from http://www.firefoxwithbing.com/
(Source: Bing blog)
Is this an indication of something is being set for the future ?