If you are seeing a Protected Content Error message, you are probably doing the same thing as me: configuring an old laptop that your boss planned to throw in the garbage because it can’t run Windows 11, and using it to watch Amazon Prime Video on Ubuntu. In my situation, it was a white MacBook that even Steve Jobs would look at me funny for still trying to use to this day, but the hardware is still solid and can run alternative operating systems with a little love and sneakiness.
The Error Message
The error is due to the way Ubuntu is shipped. There are many chromium-based browsers, but Mozilla Firefox is not one of them and for privacy, has support turned for your privacy.