The Firefox CouponPrinter plugin is installed in the Internet plugins folder in the Library folder on my Macintosh hard drive and supposedly is enabled. However, when I attempt to print a coupon using the Firefox 4.0 web browser I am informed that I need to install the CouponPrinter plugin. I have installed and reinstalled the plugin a number of times to no avail. Firefox 4.0 is not recognizing the 'CouponPrinter-firefox.plugin' plugin whatsoever. The plugin is installed and supposedly enabled and yet the plugin is dead in the water so to speak. I also have a CouponPrinter plugin for my Safari web browser which functions just fine with the Safari web browser. I do not remember ever having this problem prior to upgrading to Firefox 4.0.