How can I get rid of this bar at the bottom of my browser?

http://i.imgur.com/hccpdNi.PNG

Currently, I use firefox 21 and like the way it looks, but I tried to download firefox 39 and restorer of classic theme to see if I could get 39 to look like 21. I couldn't get it to look the same, so I deleted firefox 39, but firefox 21 now has this bar downstairs. When I click the x nothing happens.

picture is firefox 21 with bar downstairs. I had firefox 39 in a separate folder and nothing change to firefox 21.

I have redownloaded firefox 39 uninstall Classic theme restaurant and bar is now missing. Thanks for the help and quick responses.

Tags: Firefox

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