Movies in Background Tabs start playing before I select the tab
 

If I Cmd-Click to open a QuickTime movie link in a background tab (my prefs for Cmd-Click), the movie starts playing before I've selected the tab - I can hear the audio. In 5.1.3 the movie would not start playing until the tab is selected.

Request: stop playing a movie when I select a different tab. Although if someone wants to hear the audio in the background that might not be a great option.

I second the request, which would equate the behavior of Flash animations in background tabs.