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I am going to presume that there is a CSS file involved. If so, then this is most likely where your problem is.
Without seeing the CSS code for myself, I cannot tell you specifically what the problem is, but FF is quite stringent about what CSS code it accepts, compared to IE.
Try running the CSS file through
the W3C CSS Validator. It might pick up the problem and probably a few others as well ;)
If this gets too confusing, go to the template for the module, find the bit that shows the image and do this:
<div style="margin-left:auto; margin-right:auto;">Image Codediv>
If this is already there, or does not work I'll download and install the module myself and try figure it out.
Until then it is my bed time so goodnight *yawn*