I have a little white block on the bottom left corner of the firefox dropdown menu button that has no function. I have checked with friends and other computers and they don't appear to have the same issue.
the button is still functional it's just a small white square with a black dot in it. I can't really say any more
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I had that problem too. The square went away when I disabled the FoxTab (v 1.4.1) extension. It says on the website that its for Firefox 3, but other than the white square it worked fine on my FF4.