You never came back Peter but I will assume that you are using chrome and have allowed the extension to hook you. to remove it.....
To the right of your address bar, look for the extension's icon.(that is the cartageous icon) Right-click the icon and select Remove from Chrome. If you don't see the extension's icon next to your tool bar, make sure that you are currently using or have chrome open... Then(in chrome) at the top right, click, More More tools, Extensions. Then on the extension you want to remove, click Remove. Confirm by clicking Remove.