"A truly portable X application is required to act like the persistent customer in Monty Python’s “Cheese Shop” sketch, or a grail seeker in “Monty Python and the Holy Grail.” Even the simplest applications must answer many difficult questions"
Read the original for the hilariously accurate dialog that follows…
For quick access, put page 177 in pdf reader to get to printed page 139.
For pdf.js (used by Firefox), refer to https://github.com/mozilla/pdf.js/wiki/Viewer-options
If using Adobe Reader, refer https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pd...
(The second variant mentioned by you that works in Firefox using pdf.js appears to be a undocumented feature!)