The remaining of this toolbar lies on Control Panel. So the first option that you have is to check in Add/Remove programs. And then removing the add-on from Firefox. This is the most proper way of deleting the files installed with this toolbar. The most you can do is re-install Firefox to get rid of this completely. You must avoid such stuff as they contain malware infection. It is recommended to use a good internet security tool which can control this apps.
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