I have the updated firefox, but the old layout yet!

On our other computer the firefox has the new layout in which it only takes 3 rows to get all the info including the bookmark bar.. on my laptop I just updated to 18 and I still have the ridiculous 5 row layout with the page name on top, the menu bar, the tabs, the URL bar, and the bookmark bar all in separate rows! why don't I have the new layout too?

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