How to disable Flash Player protected mode in Firefox
by Logan Rogers-Follis on Feb.08, 2015, under Techie
Since Firefox 35 you can do the following to disable the annoying “Activate Flash” on any page with Flash.
In the Address Bar type in “about:config”
Confirm that you will careful when prompted
Search for “dom.ipc.plugins.flash.disable-protected-mode” and set it to true (ie disabled)