Thanks very nice Rated 5 out of 5 stars

Still works in FF 25. Personal preference tho is not to have the transparency parts shadowed by default, so changed your menu-overlay.css to suit, making it fully transparent till hovered over, just like other icons. Only needed lines 8, 9 and 11 changed

from
rgba(0,0,0,.15) 25%,
rgba(0,0,0,0.3) 50%) !important;
box-shadow: 0 0 4px rgba(0,0,0,.25) inset !important;
to
rgba(0,0,0,.00) 25%,
rgba(0,0,0,0.0) 50%) !important;
box-shadow: 0 0 4px rgba(0,0,0,.00) inset !important;

btw of the two menu icon mover addons, 'Movable Firefox Button' and 'UI Fixer', MFB works better with this. UI Fixers not bad, its just not designed with the specific coodinates Iconic Firefox Menu uses. eg ive made a replacement skin for personal thats 8 pixels larger and reduced the bottom buffer to 0, and UI Fixer handles that better, perhaps cause i designed it with UI Fixer installed

This review is for a previous version of the add-on (1.2.1-signed).