What did I do?

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When I go on firefox, the address bar isn't there. I hit something today and all of a sudden, there]s no address bar. It has the bar that has most visited, getting started. Below that are the tabs I'm on and below that is the top of the web page. So right now, the only way I can go to a website is type the site into the search, then click on it when it comes up on search results. How do I get it back to the way it was?