Have a look at
http://www.msiwisdom.com/index.php?option=com_content&task=view&id=43&Itemid=2
If you deploy QuickTime and you want to use it from within Firefox, you will get a notification about a missing Firefox plugin. This is QuickTime related. You can solve it manually by going into Control Panel, QuickTime, click on the Browser Tab, MIME settings and then click on 'Use Defaults' the integration is available after you restart Firefox. What this option does is copying a couple of QuickTime related files into your Firefox program files directory:
c:\Program Files\Mozilla Firefox\components\nsIQTScriptablePlugin.xpt
and
c:\Program Files\Mozilla Firefox\plugins\npqtplugin.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin2.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin3.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin4.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin5.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin6.dll
c:\Program Files\Mozilla Firefox\plugins\npqtplugin7.dll
c:\Program Files\Mozilla Firefox\plugins\QuickTimePlugin.class