Flash plugin crashing problem in Firefox, finally solved!

Many people are confused when the Adobe Flash plugin keeps crashing in Firefox. Instead of showing some animations or videos, it keeps saying that The Adobe Flash plugin has crashed, Reload the page to try again.

The Adobe Flash plugin has crashed.

Or even worse, it pops up a Windows crash report with the error message

Adobe Flash Player 12.0 r77
Problem signature:
Problem Event Name:    BEX
Application Name:    FlashPlayerPlugin_12_0_0_77.exe
Application Version:
Application Timestamp:    52223bb7
Fault Module Name:    StackHash_27eb
Fault Module Version:
Fault Module Timestamp:    00000000
Exception Offset:    655392cd
Exception Code:    c0000005
Exception Data:    00000008
OS Version:    6.1.7601.
Locale ID:    2057
Additional Information 1:    27eb
Additional Information 2:    27eb358fe674a6f15dafe56d42bb9bf3
Additional Information 3:    2f06
Additional Information 4:    2f06c18113e6d7c00e6b91fa1fde84b6

When you closes the window, it will pop up again in a few seconds, making it impossible to browse the page.

Adobe Flash Player 12.0 r77 has stopped working

Common solution: update the Flash plugin

There is a article from Mozilla official website Adobe Flash plugin has crashed – Prevent it from happening again, the main idea is to upgrade your Firefox and Adobe Flash plugin to latest version, using the steps below.

  1. Go to the Adobe Flash Player download page at Adobe.com and download the Flash installer.
    Caution: Adobe’s download page may include a checkbox for optional software (such as Google Chrome or McAfee Security Scan) that is selected by default. If you do not need the optional software, just clear the checkbox before downloading.
  2. When the download has finished, close all Firefox windows.
  3. Open the Flash installer file you downloaded and follow the instructions.
Well, it did work for me for a couple of days, but the Windows crash report poped up again eventually, so I searched and find another solution.

Final Solution: disable Flash’s Protected Mode

Finally, if updating Flash plugin does solve the problem for you, try temporarily disabling Protected Mode, which I solve the crashing problem for my PC and laptop.  FYI, I strongly recommend you enable Protected Mode once the Flash player works fine.
To disable Protected Mode, add the following line to your mms.cfg file located in:Windows 32bit: C:\windows\system32\macromed\flash
Windows 64bit: C:\windows\syswow64\macromed\flash


If the mms.cfg file does not exist, create one using any standard text editor (e.g.. notepad)

Depending on your operating system, you might need to first save the mms.cfg file to a writable location (such as your documents or desktop folder) and then copy the file into the destination folder using Windows Explorer.

To re-enable Protected Mode, simply remove the line from the mms.cfg file.

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