[ubuntu] Restore Firefox to full size

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http://ubuntuforums.org – This will sound a bit stupid and noobish, but here it goes. I managed to reduce the size of my Firefox window (accidentaly double-clicked on the bar on top of Firefox, which reduced the size). Problem is, I'm not able to get it back to the normal full size. I haven't found anything in the toolbar that will restore it, nor anything in the Firefox window itself. And the top toolbar where you can close, minimize and such, isn't showing anymore, so I can't use that. So I was wondering, is there a hotkey or something I could use to restore Firefox to the default size? Sorry for nooby question :) (Hardware)