The background information is all on the page. In short, I wanted what Sherlock used to have – the ability to watch a movie trailer and check the movie times all in one place.
Moriarty Dashboard Widget
Go get it. Install. Rejoice. Donate. Eat popcorn.

That previous trick does not work in Firefox 1.5.4 on the Mac, but does work on 1.5.4 on Windows. Strange. Is SetURL browser-agnostic and works on the plug-in level? Do I file the bug with Apple? We will have to investigate further investigate the implementation specs of the EMBED tag.

Let’s say you have an EMBED tag. Let’s say the src attribute points to a QuickTime movie somewhere. Let’s say you also have the autoplay attribute set to false.
If you dynamically load a new movie with the SetURL method, QuickTime will ignore the autoplay=”false” in the EMBED tag and play the newly loaded [...]