diff --git a/src/wp-admin/js/editor-expand.js b/src/wp-admin/js/editor-expand.js
index 25f86c2847..bf67c64e04 100644
--- a/src/wp-admin/js/editor-expand.js
+++ b/src/wp-admin/js/editor-expand.js
@@ -86,17 +86,21 @@
 
 			var length = textEditor.value.length;
 			var height = parseInt( textEditor.style.height, 10 );
+			var top = window.scrollTop;
 
 			if ( length < oldTextLength ) {
 				// textEditor.scrollHeight is not adjusted until the next line.
 				textEditor.style.height = 'auto';
 
-				if ( textEditor.scrollHeight >= autoresizeMinHeight ) {
+				if ( textEditor.scrollHeight > autoresizeMinHeight ) {
 					textEditor.style.height = textEditor.scrollHeight + 'px';
 				} else {
 					textEditor.style.height = autoresizeMinHeight + 'px';
 				}
 
+				// Prevent scroll-jumping in Firefox and IE.
+				window.scrollTop = top;
+
 				if ( textEditor.scrollHeight < height ) {
 					adjust();
 				}