Problem
Firefox has prevented the outdated plugin "Adobe Flash" from running on www.whatever.com Update now...
Solution
We should update the flash. However, if we want to disable a warning in every site.
Go to about:config and set
extensions.blocklist.enabled : false
ref : https://askubuntu.com/questions/582392/how-to-make-firefox-run-adobe-flash-even-when-its-outdated/643082
dsin 