How does one program HTML to run Flash in Firefox?

I have a web site with a little flash component. It is referenced by an html file I have written with a little help from Dreamweaver. The deal is that when the page comes up in IE, or Chrome, the flash component works fine but it is invisible in Firefox. Can you help? This video shows what I mean
https://www.youtube.com/watch?v=_8fFb5zo-Q8