Firefox has changed all my Adobe PDFs to Firefox HTML Documents!

I was having trouble opening up new pdfs -- Firefox would start opening up multiple tabs until I closed firefox -- and then I realized that (a) it did the same for opening existing pdfs, and (b) it had changed the file type on all my existing pdfs to Firefox HTML documents. Quite disturbing. Adobe Acrobat and Firefox are both up-to-date...what can I do to restore proper settings?

cor-el,
Your suggestions didn't work. But the solution to this problem is found -
https://support.mozilla.org/en-US/questions/1012877?esab=a&s=pdfs+become+firefox+html&r=11&as=s
The chosen solution works. All you need to do is apply (in my case in windows explorer on an acient XP machine) it to one pdf file that has been changed to a firefox html file, and it will change ALL the corrupted PDF files back to PDFs. It will leave those files that actually are HTML files alone. FWIW

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