Why won't PDFs won't preview in Firefox 36.0? (OS10.9.5)

Since updating to Firefox 36.0 (OS 10.9.5), PDFs no longer preview in Firefox: I'm prompted to download and save them -- even though in Firefox Preferences, the default selection reads: Preview in Firefox. Help, please.

Sorry, but this explanation explains nothing. Accessing the about:config page is easy. But all the passive voice bullets about what can be modified, reset, etc. don't give a clue of what '''should''' be done to make the PDF Viewer work. Isn't there a way to communicate that to those of use who don't speak technical jargon? The last bullet point is particularly impenetrable. Sorry to seem dense, but I'm actually a science writer, and a pretty well-known one. My job is to take highly technical information and jargon and put it into language that the rest of us can understand. To do that, I have to ask a lot of questions until I understand. So far here, I don't. Thanks -- AW

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