I once fixed marquee, yet i have the same problem again

Basicly my sites width is ok, on pages not using marquee.

Yet on the pages that use marquee, it causes them to be slightly over sized in firefox??

Which makes the top of the theme to wide and the pages harded to view!

Does anyone know a way to fix this?

I have a 1.3 copy of marquee from herve-thouzard, yet that still dosen't fix it

I removed the width out, the time before, which fixed it previously, yet the problems is back?

Would it be possible to add a CSS setting, so it keeps to the correct size?