seguendo questa guida:
Finally, if these problems are blocking you from using Flash Player we recommend, as a last resort, you either revert back to Flash Player 11.2 or temporarily disable Protected Mode. We strongly recommend that Protected Mode is manually enabled once this issue is resolved.
To revert to a previous version of Flash Player, please see this FAQ: How do I revert to a previous version of Flash Player?
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.
ora la domanda e: a che serve sta protected mode?
perchè se tolgo la stringa per riattivarla,firefox comincia di nuovo a non farmi vedere i video,mentre se la tolgo firefox me li fa vedere...