Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4294)
+++ /CKEditor/trunk/CHANGES.html	(revision 4295)
@@ -70,4 +70,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4397">#4397</a> : Wisiwig mode will cause the host page scroll.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4385">#4385</a> : Fixed editor's auto adjusting on DOM structure were confusing the dirty checking mechanism.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4397">#4397</a> : Fixed regression of [3816] where turn on design mode is causing Firefox3 to scroll the host page.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 4294)
+++ /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 4295)
@@ -363,9 +363,5 @@
 						}
 						else
-							// Avoid opening design mode in a frame window thread,
-							// which will cause host page scrolling.(#4397)
-							setTimeout( function(){
-								domDocument.$.designMode = 'on';
-							}, 0 );
+							domDocument.$.designMode = 'on';
 
 						// IE, Opera and Safari may not support it and throw
@@ -376,24 +372,4 @@
 						domWindow	= editor.window		= new CKEDITOR.dom.window( domWindow );
 						domDocument	= editor.document	= new CKEDITOR.dom.document( domDocument );
-
-						// Gecko need a key event to 'wake up' the editing
-						// ability when document is empty.(#3864)
-						var firstNode = domDocument.getBody().getFirst();
-						if ( CKEDITOR.env.gecko
-							&& firstNode && firstNode.is
-							&& firstNode.is( 'br' ) && firstNode.hasAttribute( '_moz_editor_bogus_node' ) )
-						{
-							var keyEventSimulate = domDocument.$.createEvent( "KeyEvents" );
-							keyEventSimulate.initKeyEvent( 'keypress', true, true, domWindow.$, false,
-								false, false, false, 0, 32 );
-							domDocument.$.dispatchEvent( keyEventSimulate );
-							var bogusText = domDocument.getBody().getFirst() ;
-							// Compensate the line maintaining <br> if enterMode is not block.
-							if ( editor.config.enterMode == CKEDITOR.ENTER_BR )
-								domDocument.createElement( 'br', { attributes: { '_moz_dirty' : "" } } )
-									.replace( bogusText );
-							else
-								bogusText.remove();
-						}
 
 						// Gecko/Webkit need some help when selecting control type elements. (#3448)
@@ -436,4 +412,30 @@
 						focusTarget.on( 'focus', function()
 							{
+								// Gecko need a key event to 'wake up' the editing
+								// ability when document is empty.(#3864)
+								if ( CKEDITOR.env.gecko )
+								{
+									var first = body;
+									while( first.firstChild )
+										first = first.firstChild;
+
+									if( !first.nextSibling
+										&& ( 'BR' == first.tagName )
+										&& first.hasAttribute( '_moz_editor_bogus_node' ) )
+									{
+										var keyEventSimulate = domDocument.$.createEvent( "KeyEvents" );
+										keyEventSimulate.initKeyEvent( 'keypress', true, true, domWindow.$, false,
+											false, false, false, 0, 32 );
+										domDocument.$.dispatchEvent( keyEventSimulate );
+										var bogusText = domDocument.getBody().getFirst() ;
+										// Compensate the line maintaining <br> if enterMode is not block.
+										if ( editor.config.enterMode == CKEDITOR.ENTER_BR )
+											domDocument.createElement( 'br', { attributes: { '_moz_dirty' : "" } } )
+												.replace( bogusText );
+										else
+											bogusText.remove();
+									}
+								}
+
 								editor.focusManager.focus();
 							});