How can I stop "Nation Advanced Search" from coming up whenever I open a new tab in Firefox running under Mac OSX?

HELP! A few days ago, "Nation Advanced Search" (NAS) tool bar started showing up when I opened Firefox. I removed the NAS application from my computer which got rid of the toolbar, but now when I click to open a new tab, the tab opens with the NAS URL. I have not been able to stop this from happening. I downloaded and installed Firefox again, but that didn't work. I used Spotlight to search for Nation Advanced Search, but no files were found. I hope someone will be able to help me with this problem, and believe me when I say I will be very grateful for any help. Thank you.

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