Firefox downloads PDF with wrong extension instead of opening a websites' PDF viewer

I have a problem with websites that want to provide their own PDF viewer. Instead of launching their viewer, Firefox wants to download the PDF. I'd be perfectly fine with that ***if it downloaded with the correct .pdf extension so that Preview would actually open the PDF***. But that's not what happens; I end up with something like "RetrieveDocument.aspx" or "Retrieve.srv".
I've tried resetting my download options (http://kb.mozillazine.org/File_types_and_download_actions). Didn't help.
I saw some stuff about other plugins I can install. Here's the thing: *this stuff works fine in Chrome and Safari*. Maybe websites aren't tagging their content correctly or something, but this stuff works fine in two other browsers.

Hello,
In order to change the default reader for PDF files (to not open PDF files with Firefox's internal PDF reader), follow these steps:
#Go to ''Tools'' > ''Options'' (or ''Firefox'' > ''Options'').
#In the Options window, select the ''Applications'' tab.
#In the ''Search'' field, type ''PDF''. You should find ''Portable Document Format (PDF)''.
#On the right handside you should find an ''Action'' column. Use that to select your favorite PDF reader. In order to view PDF files in Firefox, choose ''Preview in Firefox''.
Did this fix your problems? Please report back to us!
Thank you.

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Firefox downloads PDF with wrong extension instead of opening a websites' PDF viewer

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