Recherche personnalisée

Procédure 
 
 Open a new tab and type in the address bar: about:config 
 
 In the search box type: browser.urlbar.update2.engineAliasRefresh 
 
 Click on the little + symbol on the right 
 Go to Firefox Settings → Search. Or enter this in the address bar: about:preferences#search 
 
 In the "Search Shortcuts" section you should notice a new "Add" button. search add button 
 Press the "Add" button and fill in the name, search engine url and a keyword (optional). The engine url should contain a %s in the url; Firefox replaces the %s with your search terms. An example of this is:
https://www.google.com/search?q=%s 
 Go to the "Default Search Engine" section and select the engine you just added. 
 
 Références 
 https://superuser.com/questions/7327/how-to-add-a-custom-search-engine-to-firefox