I have a Flash movie embedded in some DIV. The trouble is that when I change any property of the enclosing DIV dynamically, Firefox (not other browsers) restarts/reinitializ
Try hiding it with visibility:hidden or if all else fails, position:absolute;left:-9999px.
visibility:hidden
position:absolute;left:-9999px
I presume Firefox doesn't want to waste memory and CPU on Flash animation that's invisible, so it kills it.