I’m sure the ATSC 3.0 private keys will be dumped sooner or later. These silly games didn’t protect DVD, HD-DVD, or BluRay.

You want a PDF viewer that’s accessible from Firefox, but you don’t want to use the built in Firefox PDF viewer?

If you really need it accessible from the browser, you’re probably looking at spinning up a Selkies docker container. That’ll get you an entire desktop environment in a web browser.