If you go out and monitor a ton of users, how many will know that a
Firefox sound control also controls Flash apps inside the browser?
They will just use the slider provided by the Flash app because that’s
what is nearby. And if the case happens where they have 20 tabs open
(rarely ever happens for normal users * **) and try to find the guilty
one, they can still use the global control.
* http://dubroy.com/blog/how-many-tabs-do-people-use-now-with-real-data/
** http://mozillalabs.com/testpilot/2009/09/30/test-pilot-ready-to-dig-into-some-data/