Shockwave Player update is loaded from an unencrypted site -> Firefox blocks it at first

I cannot update Shockwave Player without disabling the protection from unencrypted pages from third parties in my urlbar

and the page doesn't even indicate it

-> there is just a button to continue

the url of the "third party" server that Firefox doesn't load:

http://download.macromedia.com/pub/shockwave/cabs/director/sw.cab#version=12,1,3,153