Oder der andere:
CSS
#reload-button .toolbarbutton-icon {
list-style-image: url("data:image/png;base64,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")!important;
-moz-image-region: rect(0px 0px 0px 0px) !important;
min-height:32px!important;
min-width:32px!important;
margin-right: 3px !important; margin-top: 2px !important;}