Well, what an interesting issue!

The issue:
Firefox PC rendered all the flash but was not allowing any of the flash to be clickable. Yet this was fine on firefox for the mac...
We narrowed this issue down to the wmode=transparent in the param and embed tags. If we set this to opaque or window we still had the same problem if not a new one.

The flash we were using was located in a div behind a floating navigation menu. When the wmode was changed the menu would disappear and our lightbox type popup screen fade would load behind the flash. This was not acceptable.

The solution:
After a long time hunting on google, we tried numerous things such as adding overflow:auto; to the flash containing div, border 1px around the containing div.

Finally we came across something that worked, we placed the following css in our css document:

html body { border:1px solid #fff; }

Yes it does add a 1px white border around the whole site but we can live with this for functionality!!

The Project

http://www.londonelectsyou.co.uk