go to * about:config?filter=keyword.url * accept security notification * set the keyword value '''http://duckduckgo.com/?q=''' then try

''Source: http://paulrobertlloyd.com/2012/03/duckduckgo/'' 1. Visit http://duckduckgo.com/. 2. Go to the search box in the upper right of the browser window. Click the down arrow, and select Add DuckDuckGo. ''The rest is similar to the above reply by Swarnava:'' However, changing the default provider isn’t enough as search terms entered into the address bar will still use Google. Change this by completing the following steps: 1. Enter into the address bar. 2. If you get a warning, click I’ll be careful, I promise. 3. Type Keyword.URL into the filter field. 4. Double-click the value column for this item and enter http://duckduckgo.com/?q=.