--- a/toolkit/content/widgets/menu.xml
+++ b/toolkit/content/widgets/menu.xml
@@ -235,27 +235,16 @@
                 xbl:inherits="selected,disabled,checked">
         <xul:image class="menu-iconic-icon" xbl:inherits="src=image,validate,src"/>
       </xul:hbox>
       <xul:label class="menu-iconic-text" flex="1" xbl:inherits="value=label,crop,highlightable" crop="right"/>
       <xul:label class="menu-iconic-highlightable-text" xbl:inherits="xbl:text=label,crop,highlightable" crop="right"/>
     </content>
   </binding>
 
-  <binding id="menuitem-iconic-desc-noaccel" extends="chrome://global/content/bindings/menu.xml#menuitem">
-    <content>
-      <xul:hbox class="menu-iconic-left" align="center" pack="center"
-                xbl:inherits="selected,disabled,checked">
-        <xul:image class="menu-iconic-icon" xbl:inherits="src=image,validate,src"/>
-      </xul:hbox>
-      <xul:label class="menu-iconic-text" xbl:inherits="value=label,accesskey,crop" crop="right" flex="1"/>
-      <xul:label class="menu-iconic-text menu-description" xbl:inherits="value=description" crop="right" flex="10000"/>
-    </content>
-  </binding>
-
   <binding id="menu-iconic"
            extends="chrome://global/content/bindings/menu.xml#menu-base">
     <content>
       <xul:hbox class="menu-iconic-left" align="center" pack="center">
         <xul:image class="menu-iconic-icon" xbl:inherits="src=image"/>
       </xul:hbox>
       <xul:label class="menu-iconic-text" flex="1" xbl:inherits="value=label,accesskey,crop,highlightable" crop="right"/>
       <xul:label class="menu-iconic-highlightable-text" xbl:inherits="xbl:text=label,crop,accesskey,highlightable" crop="right"/>

--- a/toolkit/content/xul.css
+++ b/toolkit/content/xul.css
@@ -376,20 +376,16 @@ menubar > menu:empty {
 menuitem {
   -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem");
 }
 
 menuitem.menuitem-iconic {
   -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem-iconic");
 }
 
-menuitem[description] {
-  -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem-iconic-desc-noaccel");
-}
-
 menuitem[type="checkbox"],
 menuitem[type="radio"] {
   -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem-iconic");
 }
 
 menuitem.menuitem-non-iconic {
   -moz-binding: url("chrome://global/content/bindings/menu.xml#menubutton-item");
 }

--- a/toolkit/themes/linux/global/menu.css
+++ b/toolkit/themes/linux/global/menu.css
@@ -104,22 +104,16 @@ menulist > menupopup > menu {
   font-weight: inherit;
 }
 
 menucaption > .menu-iconic-text {
   margin-inline-start: 0 !important;
   font-weight: bold;
 }
 
-.menu-description {
-  font-style: italic;
-  color: GrayText;
-  margin-inline-start: 1ex !important;
-}
-
 .menu-accel,
 .menu-iconic-accel {
   margin-top: 0px !important;
   margin-bottom: 0px !important;
   margin-inline-start: 7px !important;
   color: inherit;
 }
 

--- a/toolkit/themes/osx/global/menu.css
+++ b/toolkit/themes/osx/global/menu.css
@@ -38,22 +38,16 @@ menuitem[_moz-menuactive="true"][disable
   font-weight: inherit;
   color: inherit;
 }
 
 menucaption > .menu-iconic-text {
   font-weight: bold;
 }
 
-.menu-description {
-  font-style: italic;
-  color: -moz-mac-menutextdisable;
-  margin-inline-start: 1ex !important;
-}
-
 .menu-iconic-icon {
   height: 16px;
   margin-top: -2px;
   margin-bottom: -2px;
   margin-inline-end: 5px;
   /* Empty icons shouldn't take up room, so we need to compensate
    * the 5px margin-end with a negative margin-start.
    */

--- a/toolkit/themes/windows/global/menu.css
+++ b/toolkit/themes/windows/global/menu.css
@@ -69,22 +69,16 @@ menuitem.spell-suggestion {
   padding-inline-end: 2px;
 }
 
 menucaption > .menu-iconic-text {
   font-weight: bold;
   padding-inline-start: 0 !important;
 }
 
-.menu-description {
-  font-style: italic;
-  color: GrayText;
-  margin-inline-start: 1ex !important;
-}
-
 .menu-accel,
 .menu-iconic-accel {
   color: inherit;
   margin-inline-start: 0.74em !important;
   margin-inline-end: 1.35em !important;
 }
 
 .menu-iconic-left {