When I try to open a new blank tab by clicking the tab icon at the far right it won't open. I'm running Windows 7 on a Dell XPS.

Windows 7 O.S., Dell XPS machine.

Uninstall the '''''Ask Toolbar'''''. It can cause that problem.
*http://support.mozilla.com/en-US/kb/Uninstalling+add-ons
*http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on
*http://kb.mozillazine.org/Uninstalling_toolbars
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Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

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