Index: src/wp-admin/js/post.js
===================================================================
--- src/wp-admin/js/post.js	(revision 27349)
+++ src/wp-admin/js/post.js	(working copy)
@@ -1064,7 +1064,7 @@
 		});
 	}
 
-	if ( ! ( 'ontouchstart' in window ) ) {
+	if ( ! ( 'ontouchstart' in window ) && $( 'body' ).hasClass( 'wp-admin' ) ) {
 		// When scrolling with mouse wheel or trackpad inside the Text editor, don't scroll the whole window
 		$content = $('#content').on( 'onwheel' in $document[0] ? 'wheel.text-editor-scroll' : 'mousewheel.text-editor-scroll', function( event ) {
 			var delta, origEvent = event.originalEvent;