Why can I not open PDF files using adobe reader in firefox?

When I try to read a PDF file with adobe reader the file looks like it starts to load, I see in the tool bar the page count but the file never opens.

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 <b>about:config</b> 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.
See also:
*https://support.mozilla.org/kb/view-pdf-files-firefox-without-downloading-them
Note that your System Details List shows that you have a user.js file in the profile folder to initialize some prefs on each start of Firefox.
*http://kb.mozillazine.org/Preferences_not_saved
The user.js file is only present if you or other software has created it, so normally it wouldn't be there.
You may want to check its content with a plain text editor if you didn't create this file yourself.
The user.js file is read each time you start Firefox and initializes preferences to the value specified in this file, so involved preferences can only be changed temporarily for the current session.

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