Flash doesn't work in Firefox

My website:
Doesn’t work properly in Firefox. The pages are minute!
The site is entirely Flash with the first movie contained within an HTML page.
In Publish Settings I chose:
Dimensions: Percent.
Width & Height: 100%
Flash Alignment: Centre.
This enables the pages to scale in Safari and Explorer to whatever size the viewer wants.
I’ve contacted Firefox.
Any suggestions as to how I can get round this?