This reason may be caused by the sandbox protection of flash, try the following operations:
Enter the directory: C:\Windows\System32\Macromed\Flash
Open the file mms.cfg and add the configuration:
ProtectedMode=0
Then restart Firefox.
This reason may be caused by the sandbox protection of flash, try the following operations:
Enter the directory: C:\Windows\System32\Macromed\Flash
Open the file mms.cfg and add the configuration:
ProtectedMode=0
Then restart Firefox.