diff --git a/toolkit/content/customizeToolbar.js b/toolkit/content/customizeToolbar.js
index 23cb255c1c2..2a51b7745c0 100644
--- a/toolkit/content/customizeToolbar.js
+++ b/toolkit/content/customizeToolbar.js
@@ -39,11 +39,6 @@
 # ***** END LICENSE BLOCK *****
 
 const kRowMax = 4;
-const kWindowWidth = 635;
-const kWindowHeight = 400;
-const kAnimateIncrement = 50;
-const kAnimateSteps = kWindowHeight / kAnimateIncrement - 1;
-const kVSizeSlop = 5;
 
 var gToolboxDocument = null;
 var gToolbox = null;
@@ -104,17 +99,12 @@ function initDialog()
 function repositionDialog()
 {
   // Position the dialog touching the bottom of the toolbox and centered with 
-  // it. We must resize the window smaller first so that it is positioned 
-  // properly. 
-  var screenX = gToolbox.boxObject.screenX + ((gToolbox.boxObject.width - kWindowWidth) / 2);
+  // it.
+  var screenX = gToolbox.boxObject.screenX 
+                + ((gToolbox.boxObject.width 
+                    - parseInt(document.documentElement.style.width)) / 2);
   var screenY = gToolbox.boxObject.screenY + gToolbox.boxObject.height;
 
-  var newHeight = kWindowHeight;
-  if (newHeight >= screen.availHeight - screenY - kVSizeSlop) {
-    newHeight = screen.availHeight - screenY - kVSizeSlop;
-  }
-
-  window.resizeTo(kWindowWidth, newHeight);
   window.moveTo(screenX, screenY);
 }
 
@@ -561,7 +551,6 @@ function addNewToolbar()
     
   gToolbox.appendCustomToolbar(name.value, "");
   
-  repositionDialog();
   gToolboxChanged = true;
 }
 
@@ -615,7 +604,6 @@ function restoreDefaultSet()
   // Restore the disabled and command states
   restoreItemAttributes(["itemdisabled", "itemcommand"], savedAttributes);
 
-  repositionDialog();
   gToolboxChanged = true;
 }
 
@@ -670,8 +658,6 @@ function updateIconSize(aUseSmallIcons)
       gToolboxDocument.persist(toolbar.id, "iconsize");
     }
   }
-
-  repositionDialog();
 }
 
 function updateToolbarMode(aModeValue)
@@ -689,8 +675,6 @@ function updateToolbarMode(aModeValue)
 
   var iconSizeCheckbox = document.getElementById("smallicons");
   iconSizeCheckbox.disabled = aModeValue == "text";
-
-  repositionDialog();
 }
 
 
@@ -922,7 +906,6 @@ var toolbarDNDObserver =
     
     gCurrentDragOverItem = null;
 
-    repositionDialog();
     gToolboxChanged = true;
   },
   
@@ -979,7 +962,6 @@ var paletteDNDObserver =
       }
     }
     
-    repositionDialog();
     gToolboxChanged = true;
   },
   
diff --git a/toolkit/content/customizeToolbar.xul b/toolkit/content/customizeToolbar.xul
index f7caef0b3a1..306641a4797 100644
--- a/toolkit/content/customizeToolbar.xul
+++ b/toolkit/content/customizeToolbar.xul
@@ -54,6 +54,8 @@
         onload="onLoad();"
         onunload="onUnload();"
         onclose="onAccept(); return false;"
+        style="&dialog.style;"
+        persist="width height"
         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
 <script type="application/x-javascript" src="chrome://global/content/customizeToolbar.js"/>
diff --git a/toolkit/locales/en-US/chrome/global/customizeToolbar.dtd b/toolkit/locales/en-US/chrome/global/customizeToolbar.dtd
index 72af9d9a9e9..ddfd9495e24 100644
--- a/toolkit/locales/en-US/chrome/global/customizeToolbar.dtd
+++ b/toolkit/locales/en-US/chrome/global/customizeToolbar.dtd
@@ -1,4 +1,5 @@
 <!ENTITY dialog.title "Customize Toolbar">
+<!ENTITY dialog.style "width: 635px; height: 400px;">
 <!ENTITY instructions.description "You can add or remove items by dragging to or from the toolbars.">
 <!ENTITY show.label               "Show:">
 <!ENTITY iconsAndText.label       "Icons and Text">