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I'm not sure these comments have still value, because FF has had a lot of versions in the mean time.
Is there a link for the theme or did you made it yourself?
Is there a link, where we can see this problem? I assume the difference is clear when using FF and IE?
Basic what is said, is that when you have a table driven theme, your block is placed in eg. a 3x3 table. The middle cell is the content and the surrounding cells are the decoration. Each cell
| is named and has in the CSS file an image specified for background.
The solution is to delete the CSS definition for the backgroung and to place the image in an image tag
I saw somewhere a solution for the center left and right cells by specifying
<div style="margin-left: 23px;"><br />div>
as the content for the cell. The margin width has to be trimmed to the wigth of the background image used.