Yes, you'll get that since you are using Micro$oft proprietary CSS for the scrollbars hence Mozilla and basically any other non-M$ browser will just display the standard scrollbars without those pale white colours.
Originally posted by Trav Mozilla is a standards-based browser.
Yep, and that's why style="background:ff0000;" only give you a red bg colour in IE
Mozilla requires that you specify either style="background:#ff0000;" or style="background-color:ff0000;"
IE is more "forgiving"