Firefox keeps changing the way it handles PDF files. Why?

I have been pulling my hair out over this one. When I click on a PDF file, I'm asked for a "save" location. When I set the application option to preview PDF files, it does so until I re-start Firefox, at which point it reverts back to "Save File." It's driving me mad.
== This happened ==
Every time Firefox opened
== Unknown

Bump. I have the same problem; in fact, it is also described here: [http://support.mozilla.com/en-US/questions/826904 http://support.mozilla.com/en-US/questions/826904]
WHY does this happen? Still no answer from Mozilla. Very disappointing...

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