set the default search engine tool in firefox
If you want to set the default search tool, follow the below steps
(*) In addressbar => type about:config
(*) Select browser.search.defaultenginename
(*) Right Click or double click the entry => Options are there.
(New, Modify, Reset etc)
(*) Type in the name of the search engine you wish to have as the default search engine.
(*) It must be one that you already have installed and also make sure you type in the name correctly.