Firefox always redownloads images, and always with a different request than the one displaying them. This frequently causes downloads to fail, or repeats large downloads. I have had this issue for years now. When I attemp to download an image, do not redownload it. Instead, save what was already downloaded. If you insist on redownloading it, then use the same request as was used to display it. There have been so many images I can see but that fail to download. It's incredibly frustrating and I was hoping someone would fix it but no one did so today I speak up. This affects desktop and mobile