I have the latest version of Firefox. Every time I try to watch a Prime video it tells me I have to update my version of Firefox before it will work. As I said, I have the latest version of Firefox, I can't update it. It shows Up To Date! How do I use Firefox to watch Prime videos? /moved thread from Firefox for iOS (for iPhone/iPad) to Firefox section since it appears you are using (desktop) Firefox on <b>macOS</b>.