Index: src/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js
===================================================================
--- src/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js	(revision 26850)
+++ src/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js	(working copy)
@@ -291,10 +291,10 @@
 				}
 			}

			// Check if we should use the new auto process method
 			if (getParam(ed, "paste_auto_cleanup_on_paste")) {
 				// Is it's Opera or older FF use key handler
-				if (tinymce.isOpera || /Firefox\/2/.test(navigator.userAgent)) {
+				if (tinymce.isOpera || /Firefox\/2\./.test(navigator.userAgent)) {
 					ed.onKeyDown.addToTop(function(ed, e) {
 						if (((tinymce.isMac ? e.metaKey : e.ctrlKey) && e.keyCode == 86) || (e.shiftKey && e.keyCode == 45))
 							grabContent(e);