Just to let you know, I found the issue with Firefox.  The html gets put in with the embed tag ending with /> but for some reason in firefox the /> was getting converted to >, therefore no "end tag" for the embed. So I replace the /> with > myself and add a </embed> before the html is put into cute editor. 

 

Now it just comes up with the Flash Icon, which I have read in other posts is done to stop firefox messing things up.

 

So it is all good for now.

 

Thanks

Justin