Create your own search engine

Its easy to create a search engine in Mozilla firefox using a Addon
"Add Search Bar" -> https://addons.mozilla.org/en-US/firefox/addon/3682.

After creation of a search engine if you want to customize it goto this location
C:\Documents and Settings\Ur_Username>\Application Data\Mozilla\Firefox\Profiles\

Open the profile directory and goto "searchplugins" folder and select the xml file created using above addon and modify it according to ur convenience.