rdr.css

#rdr-button {
list-style-image:url(chrome://rdr/skin/rdr24x24.png);
-moz-image-region:rect(0px, 48px, 24px, 24px);
}

/* Shamelessly borrowed from Mostly Crystal Theme */
button:not([id="expander"]) > .button-box > .button-icon {
margin-right:2px!important;
}

#rdr-add-to-list,#rdr-remove-from-list,#rdr-copy-clean-link,toolbar[iconsize="small"] #rdr-button,#rdr-open-uncleaned,#rdr-open-cleaned,.rdrAdd,.rdrRem,#rdr-status-button {
list-style-image:url("chrome://rdr/skin/icon.png");
-moz-image-region:rect(0px, 16px, 16px, 0px);
}

#rdr-copy-clean-link {
-moz-image-region:rect(0px, 48px, 16px, 32px);
}

#rdr-open-cleaned {
-moz-image-region:rect(0px, 64px, 16px, 48px);
}

#rdr-open-uncleaned {
-moz-image-region:rect(0px, 80px, 16px, 64px);
}

#rdr-status-button {
cursor:pointer;
}

#rdr-status-button menupopup {
cursor:default;
}

#rdr-button[enabled="true"] {
-moz-image-region:rect(0px, 48px, 24px, 24px);
}

#rdr-button[enabled="true"]:hover {
-moz-image-region:rect(0px, 24px, 24px, 0px);
}

#rdr-button[enabled="false"]:hover {
-moz-image-region:rect(0px, 72px, 24px, 48px);
}

#rdr-button[enabled="false"] {
-moz-image-region:rect(0px, 96px, 24px, 72px);
}

toolbar[iconsize="small"] #rdr-button[enabled="true"], #rdr-status-button[enabled="true"] > image {
-moz-image-region:rect(0px, 16px, 16px, 0px);
}

#rdr-remove-from-list,.rdrRem,toolbar[iconsize="small"] #rdr-button[enabled="false"],#rdr-status-button[enabled="false"] > image {
-moz-image-region:rect(0px, 32px, 16px, 16px);
}