Fix Firefox often appears the Adobe Flash plugin has crashed method

1. Run the Notepad as an administrator, as shown in the figure below (I'm using WINDOWS8)

Note: If you do not have Notepad installed, first install Notepad Windows7, find the Notepad in the Start menu, right-click and run as Administrator.

2. Open the following file with Notepad Windows 32-bit system: C:\windows\system32\macromed\flash\mms.cfg Windows 64-bit system: C:\windows\syswow64\ Macromed\flash\mms.cfg

After opening mms.cfg, add the following line of code to the end of the file:
Protectedmode=0

As shown in the following illustration:

3, confirm the changes, restart Firefox, generally there will be no flash crashes or other compatibility issues