It was one of my first good impressions of Linux, when I found out that I could watch movie trailers in fullscreen with mplayerplug-in (the mplayer plug-in for Mozilla) - a feature that, at the time, was blatantly missing from the QuickTime browser plug-in on Window$.
A few months ago something has changed at the trailers site and mplayerplug-in started crashing Iceweasel whenever I tried to watch any movie trailer (see Debian bug #527293). I searched for a fix and learned that mplayerplug-in has been superseded by gecko-mediaplayer (from the same author). So, after verifying that it worked on apple.com/trailers, I made the switch and never looked back.
A few weeks ago gecko-mediaplayer started acting up too, due to another change by Apple. This time the browser would not crash but I could no longer watch video clips either (see Issue #34 on the gecko-mediaplayer issue tracker).
It seems that the trailers site requires that the media player, which is used to play the video clips, identify itself as QuickTime. A fix for this issue has already been implemented upstream, but it'll take some time before it trickles downstream to Debian.
In the meantime, I use the User Agent Switcher Firefox add-on to masquerade both browser and plug-in as QuickTime, when visiting apple.com/trailers:
- select Tools->Default User Agent->Edit User Agents...
- select New->New User Agent...
- type "QuickTime (apple.com)" in the Description edit box
- copy the following string to the User Agent edit box:
QuickTime/7.6.2 (qtver=7.6.2;os=Windows NT 5.1Service Pack 3)(got this from a message on the mplayerplug-in mailing list)
- remove any text from all the other edit boxes
- press OK until you get back to the browser