The trouble appears to be that you're browsing your site with an https:// (secure-encrypted) URL, whereas our standard View Cart button code loads our cart javascript into your page with a regular http:// URL, so Firefox is blocking that for being an "insecure" (non-encrypted) script in a secure page.
You can remedy this by using regular http:// to browse your site; there's really no reason your sales page would need to be secure-encrypted, as no personal/financial data is being transmitted there, and we automatically handle the transition to a secure checkout page where such data would be transmitted. However, if you need or simply prefer to keep your sales page under an https:// URL, you can make your E-junkie cart buttons compatible by changing all instances of http:// to https:// in the button code.
