Stop firefox changing default program of .pdf extension on install

i need to install firefox on a terminal server, but when I have installed version 31.00 on client machines it always changes the .pdf file extension from Adobe Reader to Firefox's version. I need to be able to install this without fear of having to change the default file association for each user..
can anyone assist in this please?

hello, see this point in the [https://www.mozilla.org/en-US/firefox/31.0/releasenotes/ ff31 release notes]:
''audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only)''
this change was introduced through https://bugzilla.mozilla.org/show_bug.cgi?id=452254 but should only apply when no other program was set as pdf viewer during the time of the firefox installation. (also see comment 38, it apparently doesn't happen during a regular update or when firefox isn't set as default browser in the installer). if it is really overwriting the adobe programs in your environment i'd recommend filing a new bug at bugzilla.mozilla.org with more details about your system...

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