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Microsoft Bing Search with search suggestions
This is especially for thoses who are bored with google search , this has some great extraordinary special new features . Installing this addon , will give you power to search Bing with single click.

Download this addon from this link https://addons.mozilla.org/en-US/firefox/addon/12205
A must try out one time
Here is the long description given on firefox addons page

Long Description

Bing provides great general search results, relevance, a big index and speed — all of the hallmarks of a good search engine. However, because sorting through search results can often be time consuming, Bing organizes popular results in a different way, designed to help you get the answers you’re looking for without having to guess the right way to phrase a search term.