User Agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Build ID: 20110928134238 Steps to reproduce: (for example) 1. Disable all plugins, except adobe flash 2. Open some tab[s] with flash contents, better if it will play sound (i.e. something like youtube) 3(1). Close all tabs with flash contents or 3(2). Disable flash plugin Actual results: Music plays after disabling plugin (or closing tabs), plugincontainer.exe exists and its memory usage not reduced. Bad news: this behaviour not always appear. Expected results: Disabled plugin should be deactivated of course. Also, unused plugin should not be active.