I have an empty line on my toolbars that I'd like to get rid of. Right-clicking does not pull up any options, so how would I do this?

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I have a four-line toolbar. The fourth line is completely empty, so I'd like to remove it. I tried right-clicking to pull up a menu, but nothing appears. How can I remove this empty line? The empty line appeared just now after I disabled a Bing toolbar. I probably will eventually uninstall the Bing toolbar, but I hope the empty line is not there until I do that. Thanks much.
Thanks for the quick response. I noticed that my Yahoo toolbar was not being displayed. It just so happens that at one point, I exited Firefox and then went back in later. When I went back in, the 'empty' line was populated by the Yahoo toolbar.
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