Go to Preferences > Search and set keywords for each search engine.
E.g. I use "g" for Google and "w" for Wikipedia. "g hacker news" in the AwesomeBar would then search for "hacker news" on Google and "w hacker news" likewise on Wikipedia.
E.g. I use "g" for Google and "w" for Wikipedia. "g hacker news" in the AwesomeBar would then search for "hacker news" on Google and "w hacker news" likewise on Wikipedia.