PS TO BELOW: Obviously not (!) based on your last post that seems to have been sent coincidentally with this original. I'll leave it though, in case of interest to anyone with a Firefox Search Bar
--------------------------------------------------------------------------------
Do you mean the Firefox
Search Bar (which in your case might just be defaulted to Google)? If so there should be a small 'down' arrow to the left of the window. On the 'drop down' see
Manage Search Engines.... You can add/remove, move up/down, etc. (deselect 'Show suggestions' if you don't want somebody else's suggestions).
There is a whole new world of search options for your search bar if - while there - you select 'Get More Search Engines'. It will bring up a web page with a few additional candidates, but more interestingly go to the bottom of the page and click the link to
http://mycroft.mozdev.org/