Install Firefox 19 without built-in PDF viewer to 300+ computers.

I would like to install Firefox 19 to my company, but the built-in PDF viewer does not suit our needs. I need a way to ensure when all 300+ machines are updated they use Adobe as the in-browser reader.
Setting the preferred pdf reader on each machine really isn't an option. If I can push a config file out with the package to ensure this, that would be ideal.

hello, you can try setting the '''pdfjs.disabled''' preference to '''true''' with the method described at: http://kb.mozillazine.org/Locking_preferences

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