Today we’ve covered that Flash Player 11.3 has been released by Adobe with Protected Mode by default for Firefox. Sandboxed Flash Player running in Firefox prevents your system from attacks from malicious SWF files. But if you’re facing issues with Flash Player Protected Mode in Mozilla’s browser, you can disable it to troubleshoot those.
Disabling Sandboxed Flash Player in Firefox
From the first beta release notes PDF of Flash Player Protected Mode(PM) for Firefox we came to know that, PM can be disabled by adding a setting “Protected Mode =o” to mms.cfg file. Here is what that PDF states
“The Protected Mode sandbox could cause compatibility issues with existing Flash content on the web If however, you see a potential problem that may be related to Protected Mode, you can disable Protected Mode with the following setting in your mms.cfg file:
ProtectedMode = 0“
What is mms.cfg file?
We’re assuming by default when Flash Player installed on your system, it places mms.cfg file and Flash Player uses settings defined in it to manage its functionality.
mms.cfg file is a a text file, it is located in the following system directory
Configuring mms.cfg file: To locate mms.cfg file, you need to enter the above path in Run command, open mms.cfg file with Notepad and add “ProtectedMode = 0” in the third line. (There are pre-exists two settings already pre-exists, they’re: “AutoUpdateDisable=0” and “SilentAutoUpdateEnable=1” (these values for these settings may be different for you, which we can’t confirm)).
That’s it! Flash Player’s Protected Mode has been disabled for Firefox. When troubleshooting is over, turn it back on, that’s what Adobe recommends “Adobe recommends that you keep Protected Mode enabled at all times”.
How to Confirm Flash Player Protected Mode was disabled for Firefox?
When Protected Mode has been turned on, you can see two child processes of “FlashPlayerPlugin_11_300_257.exe” running in the Task Manager, you won’t see them when protected Mode is disabled except running of Firefox.exe and Plugin-container.exe processes.
To enable Protected Mode again, remove “ProtectedMode = 0” line we added earlier in mms.cfg file and save the changes.
Update: After installing Flash Player 11.3, we’ve experienced crashes. Makes sure to add ProtectedMode entry as it is mentioned above including spaces. If you can’t find mms.cfg file in your Computer in above mentioned directory, you can download that file from the link below.