If you are on Windows Vista/7 and notice Firefox 13 constantly crashing the culprit is the new “Protection Mode” (which makes flash run in a sandbox).

To disable this you need to append “ProtectedMode=0” to the flash config file “mms.cfg”

Detailed Instructions

STEP 1: Open Administrative Command Prompt

    Click Start.
    In the Start Search box, type cmd, and then press CTRL+SHIFT+ENTER.
    If the User Account Control dialog box appears, click Continue.

STEP 2: Run the following commands

64 bit instructions

takeown /F %windir%\syswow64\macromed\flash\mms.cfg
echo ProtectedMode=0 >> %windir%\syswow64\macromed\flash\mms.cfg
taskkill /F /IM firefox.exe /T
taskkill /F /IM plugin-container.exe /T

32 bit instructions

takeown /F %windir%\system32\macromed\flash\mms.cfg
echo ProtectedMode=0 >> %windir%\system32\macromed\flash\mms.cfg
taskkill /F /IM firefox.exe /T
taskkill /F /IM plugin-container.exe /T
Last modified: June 21, 2012

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