My tabs are on the side... how to get them back to normal?

Okay here's the story - I was sitting here, cat jumped on my lap and then on my laptop. I tried to slide him off or move him and he just kept grabbing on and flattening himself across the keyboard. Three point seven seconds, he managed to destroy a lot of things. He moved my tabs to the right hand side of the screen I CANNOT get them back, no matter what. He didn't open any dialogs or any settings, nothing was typed and I don't know how on earth this happened. I have provided a screenshot of what it looks like:

As you can tell, the background of my desktop shows (and other windows behind firefox). It is just like the top bar is - transparent. How can I get my tabs back where they were? I really really dislike this.

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