Why Firefox 31 change all icons PDF and open in browser, require a fix by using REGEDIT to set for all USERS on a computer?

The solution to use REGEDIT in the question linked below almost fixed my problem with PDF files on more than 30 computers with multiple users on each computer:
https://support.Mozilla.org/en-us/questions/1013642

But I need to fix for all users on a computer without logging on each account on each computer. My challenge was to log on as an administrator and change the following key of the overall system instead:

HKEY_LOCAL_MACHINE\Software\Classes\.PDF

Name: by default
Type: Reg_SZ
Data: FirefoxHtm

Changed FirefoxHtm to AcroExch.Document.11 data

I use Adobe Reader XI on Win7 Pro 64-bit machines.
The problem started when I ran a file downloaded to install the new version of Firefox on computers.

Why Firefox would require me to use REGEDIT in this way to solve the problem?

This only happens when you set Firefox as the default browser and Firefox thinks that there is currently no application PDF file handles.

Tags: Firefox

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