If the shopping cart does not appear when you click on "ADD TO CART" BUTTON,
is because you have your "SECURITY LEVEL" setting
in your TOR BROWSER set to "SAFEST"
However, this is not necessary for the normal user.
Change the setting to "STANDARD" and our shopping system will work.
Restart your TOR Browser.
See here how to do this:
https://tb-manual.torproject.org/security-settings