I am unable to uninstall this high risk addon shown below in Firefox Ad Data

Index of file:///C:/Users/lago/AppData/Roaming/SpecialSavings/

Up to higher level directory Name Size Last Modified File:SpecialSavings_2.0.0.crx 25 KB 19-Aug-12 6:03:42 PM

Anyone know how to get rid of it please?