Copy it to the "browser" package in the Firefox installation directory, my path is "D:\Program Files (x86)\Mozilla Firefox\browser"
Restart the Firefox browser, enter "about:addons" in the address bar, search for "11.4", and see if there is this plugin
Disable the original Flash plugin, use 11.4
and delete it
This way the Flash plug-in works normally
Reference website: http://tieba.baidu.com/p/2673481884Open the link