xml tag has uppercase letter is not working in FF2.0

Hi all,
If I changed the <product> to <Product>, and also changed the setColumn([..., Product, ...]). then FF 2.0 won't show the product content in that column. But I.E. has no problem.
Any idea?!

Firefox does not support XML Data Islands - this is IE-only feature. Firefox treats them as user-defined html tags and converts to lower case.

If you switch to external XML files - it should work fine in both IE and FF.