You get suggestions whenever you type in the address bar of the Firefox web browser which are displayed in a small overlay window as you type.
Suggestions are currently limited to bookmarks, the browsing history and open websites in tabs in the browser but will soon include live search suggestions on top of that provided that the feature is supported by the selected search engine.
Firefox users who run a recent Nightly version of the browser, version 41 currently, can test the feature already in the browser as it just landed in it.
Suggestions are only displayed if none or only a few other suggestion types are available. For instance, if there is no bookmark, history entry or open tab that matches the query, you may see suggestions similar to the one on the screenshot below.
Firefox displays "Search with [engine name]" on hover indicating that this is a suggestion and not retrieved from the browsing history, bookmarks or open tabs. The first "Search with [engine name]" is not a suggestion but simply a visual hint that you can type something in the address bar to search for it using the default search engine.
Veteran Firefox users may know the feature from the browser's separate search box as it supported the feature for some time.
It is debatable whether the feature adds anything of importance or use to the browser. While less-experienced users may find it beneficial to some degree, it is unlikely that veteran users may find it useful at all.
Firefox would not be Firefox if it would not offer options to customize the feature. Mozilla added customization options to the Firefox option.
Load about:preferences#privacy in the browser's address bar and locate the Location Bar group on the page. There you find listed -- next to History, Bookmarks and Open Tabs -- the new "Related searches from the default search engine" option.
If you uncheck its box, search suggestions won't be displayed anymore by the browser when you type in the address bar.
Firefox users who prefer to use about:config or the prefs.js file directly need to switch the value of the preference browser.urlbar.suggest.searches to false.
It is unclear right now when the new feature lands in the stable version of the Firefox browser but the target for now is Firefox 41. (via Sören Hentzschel)
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