How can I deactivate Firebug in Mozilla Firefox?

It opens at the bottom of all my browser windows, even though I click on SHIFT +F12 to deactivate it.  It has taken over my web browsing experience....I can see the usefulness of it, but don't wan't it popping up while I'm reading my e-mails. I have Windows 7.
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Try "ctrl+shift+s", or check via the menu under "Web Developer".
sheana11Author Commented:
This worked, thank you very much!
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