I wanted to explain how to rename Firefox Search Plug-ins. First you gotta figure out where the plugins are. They are usually in your firefox profile folder in the searchplugins folder. The other location you gotta find. Replace amazon with one of your search plugin name.
Code:
find / -iname *amazon* 2>/dev/null
My folders are here.
/usr/lib/firefox-4/searchplugins/
/home/username/.mozilla/firefox/uvep6v2l.default/searchplugins
Open up the xml file and rename it to whatever you want.
http://www.makeuseof.com/tag/how-to-...arch-plug-ins/