how to fix unresponsive script error in firefox

neither disabling add-ons and downgrading flash version to 10.3 nor removing all firefox and flash related stuff then having a clean install solved my problem. I got stuck with crashing firefox even can't open adobe's page to install flash. after an hour i found this solution and everything works brilliantly. disabling protection mode in flash version 13.xx makes things okay.

first of all you may want to backup your firefox profile:
find mms.cfg file matches with your operating system 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.