diff --git a/src/support.js b/src/support.js
index a95e5f2fe..d1cccee2f 100644
--- a/src/support.js
+++ b/src/support.js
@@ -180,7 +180,6 @@ jQuery.support = (function( support ) {
 		div.innerHTML = "";
 		div.style.cssText = "box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;padding:1px;border:1px;display:block;width:4px;margin-top:1%;position:absolute;top:1%;";
 		support.boxSizing = ( div.offsetWidth === 4 );
-		support.doesNotIncludeMarginInBodyOffset = ( body.offsetTop !== 1 );
 
 		// Use window.getComputedStyle because jsdom on node.js will break without it.
 		if ( window.getComputedStyle ) {
diff --git a/src/traversing.js b/src/traversing.js
index 79e1c4964..cceb9d5a4 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -246,7 +246,7 @@ jQuery.extend({
 // Implement the identical functionality for filter and not
 function winnow( elements, qualifier, keep ) {
 
-	// Can't pass null or undefined to indexOf in Firefox 4
+	// Can't pass null or undefined to indexOf
 	// Set to 0 to skip string check
 	qualifier = qualifier || 0;