They say “this is the only officially supported Bing add-on, provided by the Bing team in Microsoft.” We have to believe them (after seeing the EULA we give them credit), since there is a smilarly named add-on by Daniel Hoo that  places ads before the actual search results.

The plugin is very simple and installs Bing into the list of search engines available on the  right.

Bing 20090531, by longzheng

This add-on promises search suggestions, but it doesn’t deliver. It does the same thing as the official add-on.

You can see the other add-ons by searching for Bing in the Firefox add-ons window. If you use Internet Explorer, here’s a list of Bing add-ons for IE