When i loaded the latest version of firefox i was no longer able to open PDF files with Adobie.
I up graded to the new version of fire fox .05 and no longer have my PDF open. I use Adobie. On my lap top they open using 04.
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See this support article. https://support.mozilla.org/en-US/kb/disable-built-pdf-viewer-and-use-another-viewer
You can change the action for Portable Document Format (PDF) from Preview in Firefox to use another application like the Adobe Reader or set to Always Ask in "Firefox > Options/Preferences > Applications".
You can set the pdfjs.disabled pref to true on the about:config page to disable the build-in PDF viewer.
You can check the value of the plugin.disable_full_page_plugin_for_types pref on the about:config page and remove the application/pdf part if present or reset the pref to the default via the right-click context menu if you want to display PDF documents in Firefox with another application (i.e. not the built-in PDF Viewer).
See also: