I messed up Firefox's UI, how to undo the change?

I wasn't exactly sure if this is the correct place to post this thread, so I apologize if it was the incorrect place.


I accidentally pressed a combination of keys, which changed the UI from the default type.

Here's what my messed up UI looks like:


Here's what it used to look like (Btw, I'm using Windows 7, Classic theme. I've also disabled the Aero glass eyecandy before the UI screwup):

 

right click next to the new tab "plus" sign and choose menu bar. or left click on firefox at the top and hover over options, then choose menu bar.

 

Right, except you're going to disable the menu bar rather than enable it, in order to get the "Firefox" button back and eliminate the menu bar. You don't need to click on the "+" sign either; you can right click anywhere near a tab where the menu bar is.

 

I think that's what I said. click next to the new tab.