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The “Awesome”-bar, otherwise known as the address bar, has a few nifty little things you can tweak. First off, you can turn it back into a boring old address-bar. To do this you go to the (for now) awesome-bar, then direct your browser to
about:config. In the filter enter
browser.urlbar.maxRichResults, and change its value to -1.
If you only want it to show you websites whose URL you’ve actually entered the address for, go to
about:config and find the entry
browser.urlbar.matchonlytyped. Change its value to true.
To remove addresses from the Awesome-bar that you haven’t visited, you once more go to
about:config. Find the entry
places.frecency.unvisitedBookmarkBonus, and set its value to 0.
Lastly, to remove all addresses from the Awesome-bar, you go to
about:config, find the entry
places.frecency.bookmarkVisitBonus, and set its value to 0.