1. In the Location bar, type about:config and press Enter.
2. Find the "browser.fixup.alternate.enabled" setting in the list of preferences
3. Double-click the "browser.fixup.alternate.enabled" preference to change its value to "true/false".
To toggle the internet keyword search:
1. In the Location bar, type "about:config" and press Enter
2. Find the "keyword.enabled" preference in the list of preferences
3. Double-click the "keyword.enabled" preference to change its value to false/true.
To change the keyword search service, follow step 1.
2a. Find the "keyword.URL" preference
3a. Change the "keyword.URL" preference to "http://search.yahoo.com/search?p=" for yahoo or "http://www.bing.com/search?q=" for bing, or any other appropriate search URL for the corresponding search engine.