I've made a payment to an online store and they're claiming there's no order with the number that appeared in my screen, therefore they're refusing to send me the product. I still have the page opened and I would like to save the entire content of the page in a way that the certificate goes together, so I can prove all that content was generated by them, so I can prove that order number were given to me.
How to do it? I've saved the HTML page already, and the certificate too, but I don't think it'll work. Can I do it in firefox? (the page is already open there).