how to help FireFox use the cid: schema to find incoming images

I'm writing a home-grown email client (Python email module, yay!), and I've received an email with a couple of images with Content-ID: fields. Sure enough, the HTML bears corresponding URLS with cid: schema. Where do I put those image files so FireFox can read them, and when I run FIreFox, how do I tell it where those files are?I'm writing a home-grown email client (Python email module, yay!), and I've received an email with a couple of images with Content-ID: fields. Sure enough, the HTML bears corresponding URLS with cid: schema. Where do I put those image files so FireFox can read them, and when I run FIreFox, how do I tell it where those files are?