diff -r f507feede89a -r 09a1c134465b web/wp-includes/js/tinymce/plugins/tabfocus/editor_plugin_src.js
--- a/web/wp-includes/js/tinymce/plugins/tabfocus/editor_plugin_src.js	Wed Dec 19 12:35:13 2012 -0800
+++ b/web/wp-includes/js/tinymce/plugins/tabfocus/editor_plugin_src.js	Wed Dec 19 17:46:52 2012 -0800
@@ -22,7 +22,7 @@
 				var x, i, f, el, v;
 
 				function find(d) {
-					el = DOM.select(':input:enabled,*[tabindex]');
+					el = DOM.select(':input:enabled,*[tabindex]:not(iframe)');
 
 					function canSelectRecursive(e) {
 						return e.nodeName==="BODY" || (e.type != 'hidden' &&