-moz-image-region in menuitems

Does anybody know whether it is possible to use -moz-image-region in  menu and 
menuitem elements?

At the moment the image just shows squashed over the whole height of 32px. Here is a 
rule that appears to be active on the menuitem.

menupopup.QuickFolders-folder-popup menuitem.color
{
        background-position: 4px 0px  !important;
        background-repeat: repeat-x !important;
        border: 1px solid #444 !important;
        list-style-image : 
url('chrome://quickfolders/skin/ico/folder-color.png') !important;
        -moz-border-radius: 5px 5px 0 0;
        -moz-image-region: rect(0px, 16px, 16px, 0px) !important;
}

the question is, does this not work on list-style-image when in a menuitem (of class 
menuitem-iconic). Do I need to apply it on a lower level?
menuitem > image?

Or is it completely impossible to use -moz-image-region in menus?

thx
Ax
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