Good thinking. Good professor and good hydrodynamics at work
Apparently a recent Firefox update reset my selection of what to do if Firefox is redirected to a URL that points to a PDF. After resetting this option to "Preview in Firefox" everything works as it did before the update.
I discovered this when I got the same blank screen when redirected to a PDF on an entirely different page. This generalized my focus away from HMT and onto the more general "Firefox doesn't know what to do when sent to a PDF" idea. From there a bit of searching quickly located the problem.
For users who may be having the same problem here's the procedure I used in Firefox Quantum version 68.0.1...
Click on the Options tab and scroll down to Applications
Locate "Portable Document Format (PDF)" and right click on it
Select the "Preview in Firefox" option
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