I believe that it works the same in FF and other browsers, but you may need to get a link to your swf element differently than IE.
IE will use an object tag, usually with id, and ff / safari / etc will use the embed tag, and since you do not have to be the same identifier on two elements, people usually use the name attribute instead of the id attribute in the embed tag .
If you use something like SWFObject to embed your swfs, then you should only get one or the other (object or embed), and depending on what is written, it will have the id attribute specified with what you specify so that you could iterate over the object.
Geoff source share