gecko-dev/themes/modern/global/menu.css

 
menubar 
  {
    background-color      : white;
  }

menubar > toolbargrippy 
  {
    display               : none;
  }

menu, menuitem  
  {
    color                 : #000000;
	  vertical-align        : middle;
  }

menu[disabled="true"], menuitem[disabled="true"],
menu[menuactive="true"][disabled="true"],
menuitem[menuactive="true"][disabled="true"]
  {
	  color                 : #999999;
  }

/* XXX menupopups have to have a color explicitly specified. this is a bug */
menupopup, popup 
  {
    background-color      : #CCCCCC;
    border                : 1px solid #336699;
  }

menupopup > menu, popup > menu,
menupopup > menuitem, popup > menuitem
  {
    max-width             : 250px;
    min-width             : 125px;
    margin-left           : 0px;
    margin-right          : 0px;
    margin-top            : 0px;
    margin-bottom         : 0px;
  }

menuseparator 
  {
    border-bottom         : 1px solid #336699; 
    margin                : 2px 0px 2px 0px;
  }

menubar > menu 
  {
    border                : 1px solid #FFFFFF;
    padding               : 2px 3px 2px 3px;
    margin                : 2px 0px 2px 0px;
  }

menupopup > menu, menupopup > menuitem,
popup > menu, popup > menuitem
  {
    padding               : 2px;
  }

menubar > menu[menuactive="true"] 
  {
    border                : 1px solid #CCCCCC;
    background-color      : #CCCCCC;
    -moz-border-radius    : 4px;
  }

menubar > menu[menuactive="true"][open="true"] 
  {
    border                : 1px solid #336699;
    border-bottom         : 1px solid #CCCCCC;
    background-color      : #CCCCCC;
    -moz-border-radius    : 4px 4px 0px 0px;
  }

menupopup > menu[menuactive="true"],
menupopup > menuitem[menuactive="true"],
popup > menu[menuactive="true"],
popup > menuitem[menuactive="true"]
  {
    background-color      : #336699;
    color                 : #FFFFFF;
  }


/** 
 * Atomic sub-parts of standard menus
 **/
.menu-right 
  {
    margin                : 0px 0px 0px 6px;
    width                 : 8px;
    text-align            : center;
    list-style-image      : url("chrome://global/skin/menu-arrow.gif");
  }

.menu-iconic-left 
  {
    color                 : inherit;
    margin                : 0px 2px 0px 0px;
    width                 : 13px;
    text-align            : center;
    list-style-image      : inherit;
  }

.menubar-left 
  {
    color                 : inherit;
    margin                : 0px 2px 0px 0px;
  }

.menu-iconic-text, .menu-iconic-accel, .menu-text, .menu-accel 
  {
    color                 : inherit;
    margin                : 0px 2px 0px 0px;
  }

.menu-text 
  {
    padding-left          : 15px;
  }

.menu-accel 
  {
    margin-left           : 4px;
    padding-right         : 14px;
  }

.menu-iconic-accel 
  {
    margin-left           : 4px;
  }

.menubar-text 
  {
    color                 : inherit;
    margin-right          : 2px;
  }

menuitem[checked="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-check.gif");
  }

menuitem[checked="true"][disabled="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-check-disabled.gif");
  }

menuitem[checked="true"][menuactive="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-check-hover.gif");
  }

.menu-right[disabled="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-arrow-disabled.gif");
  }

.menu-right[menuactive="true"][disabled="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-arrow-disabled.gif");
  }

.menu-right[menuactive="true"] 
  {
    list-style-image      : url("chrome://global/skin/menu-arrow-hover.gif");
  }

/** Tooltips (tooltip <popup> element)
 *  class="tooltip"
 **/
.tooltip
  {
    background-color      : #FFFFCC;
    border                : 1px outset #FFFFCC;
    color                 : #000000;
    font                  : smaller;
    padding               : 3px;
  }