--- a/toolkit/content/widgets/dialog.xml
+++ b/toolkit/content/widgets/dialog.xml
@@ -432,19 +432,9 @@
         if (btn)
           btn.setAttribute("default", event.originalTarget == btn || !(event.originalTarget instanceof Components.interfaces.nsIDOMXULButtonElement));
       </handler>
 #endif
     </handlers>
 
   </binding>
 
-  <binding id="dialogheader">
-    <resources>
-      <stylesheet src="chrome://global/skin/dialog.css"/>
-    </resources>
-    <content>
-      <xul:label class="dialogheader-title" xbl:inherits="value=title,crop" crop="right" flex="1"/>
-      <xul:label class="dialogheader-description" xbl:inherits="value=description"/>
-    </content>
-  </binding>
-
 </bindings>

--- a/toolkit/content/xul.css
+++ b/toolkit/content/xul.css
@@ -980,20 +980,16 @@ stringbundle {
 /********** dialog **********/
 
 dialog,
 dialog:root /* override :root from above */ {
   -moz-binding: url("chrome://global/content/bindings/dialog.xml#dialog");
   -moz-box-orient: vertical;
 }
 
-dialogheader {
-  -moz-binding: url("chrome://global/content/bindings/dialog.xml#dialogheader");
-}
-
 /********* page ************/
 
 page {
   -moz-box-orient: vertical;
 }
 
 /********** wizard **********/
 

--- a/toolkit/themes/osx/global/dialog.css
+++ b/toolkit/themes/osx/global/dialog.css
@@ -18,57 +18,16 @@ dialog {
 }
 
 /* ::::: dialog buttons ::::: */
 
 .dialog-button {
   font: menu;
 }
 
-/* ::::: dialog header ::::: */
-
-dialogheader {
-  margin: 0 5px 5px;
-  padding: 5px 8px;
-}
-
-.dialogheader-title {
-  margin: 0 !important;
-  font-size: larger;
-  font-weight: bold;
-  display: none;
-}
-
-/* ::::: large dialog header ::::: */
-
-.header-large {
-  -moz-box-orient: vertical;
-  margin: -14px -14px 0;
-  padding: 12px;
-  padding-inline-end: 5px;
-  padding-inline-start: 25px;
-}
-
-.header-large > .dialogheader-title {
-  font: inherit;
-  font-weight: bold;
-}
-
-.header-large > .dialogheader-description {
-  margin-left: 12px !important;
-}
-
-.dialogheader-description {
-  font-weight: bold !important;
-}
-
-.dialogheader-title {
-  font-weight: bold !important;
-}
-
 /*XXX - belongs to toolkit/content/finddialog.xul: */
 
 #findDialog,
 #findDialog > menu,
 #findDialog > groupbox {
   font: menu !important;
 }
 

--- a/toolkit/themes/windows/global/dialog.css
+++ b/toolkit/themes/windows/global/dialog.css
@@ -19,56 +19,8 @@ dialog {
 
 /* ::::: dialog buttons ::::: */
 
 .dialog-button {
   font: menu;
   margin-top: 6px;
 }
 
-/* ::::: dialog header ::::: */
-
-dialogheader {
-  margin: 0px 5px 5px 5px;
-  border: 2px solid;
-  -moz-border-top-colors: ThreeDShadow ThreeDDarkShadow;
-  -moz-border-right-colors: ThreeDHighlight ThreeDDarkShadow;
-  -moz-border-bottom-colors: ThreeDHighlight ThreeDDarkShadow;
-  -moz-border-left-colors: ThreeDShadow ThreeDDarkShadow;
-  padding: 5px 8px;
-  background-color: Highlight;
-  color: HighlightText;
-}
-
-.dialogheader-title {
-  margin: 0px !important;
-  font-size: larger;
-  font-weight: bold;
-}
-
-/* ::::: large dialog header ::::: */
-
-.header-large {
-  -moz-box-orient: vertical;
-  margin-top: -8px;
-  margin-bottom: 0;
-  margin-inline-start: -8px;
-  margin-inline-end: -10px;
-  border-left: none;
-  border-right: none;
-  border-top: none;
-  -moz-border-bottom-colors: ThreeDHighlight ThreeDShadow;
-  padding-top: 12px;
-  padding-bottom: 12px;
-  padding-inline-start: 25px;
-  padding-inline-end: 5px;
-  background-color: Window;
-  color: WindowText;
-}
-
-.header-large > .dialogheader-title {
-  font: inherit;
-  font-weight: bold;
-}
-
-.header-large > .dialogheader-description {
-  margin-inline-start: 12px !important;
-}