[dao-]

The proper end user settings for this are currently in about:preferences#privacy (also linked to from about:preferences#search where most users would probably expect them). We have a myriad of about:config prefs affecting the address bar that are hard to keep track of and understand even for Firefox engineers (e.g. because the term "suggest" is overloaded), so I'd avoid recommending about:config to end users even among the Hacker News audience.

[masfuerte]

The UI doesn't let you turn off searching from the address bar. It does let you choose to have a separate search box, but that doesn't seem to alter the address bar's behaviour. And when you do disable search with about:config the prompt still reads "Search with Bing or enter address".

[freditup]

Thanks for the improved tip - I have found it hard to parse through all the address-bar-related about:config options in the past, the UI seems like a better way!