diff --git a/chrome/content/zotero/bindings/tagselector.xml b/chrome/content/zotero/bindings/tagselector.xml
index d7954cc8f7..28c66db623 100644
--- a/chrome/content/zotero/bindings/tagselector.xml
+++ b/chrome/content/zotero/bindings/tagselector.xml
@@ -105,7 +105,7 @@
 				<parameter name="skipRefresh"/>
 				<body>
 				<![CDATA[
-					if (Zotero.hasValues(val)) {
+					if (!Zotero.Utilities.prototype.isEmpty(val)) {
 						this._hasFilter = true;
 						this._filter = val;
 					}
@@ -126,7 +126,7 @@
 			<property name="scope" onget="return this._scope">
 				<setter>
 				<![CDATA[
-					if (Zotero.hasValues(val)) {
+					if (!Zotero.Utilities.prototype.isEmpty(val)) {
 						this._hasScope = true;
 						this._scope = val;
 					}
diff --git a/chrome/content/zotero/overlay.js b/chrome/content/zotero/overlay.js
index 33e94154d2..b35928eb8a 100644
--- a/chrome/content/zotero/overlay.js
+++ b/chrome/content/zotero/overlay.js
@@ -971,7 +971,7 @@ var ZoteroPane = new function()
 	
 	
 	function clearTagSelection() {
-		if (Zotero.hasValues(this.getTagSelection())) {
+		if (!Zotero.Utilities.prototype.isEmpty(this.getTagSelection())) {
 			var tagSelector = document.getElementById('zotero-tag-selector');
 			tagSelector.clearAll();
 		}
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 73e64822a4..186e329c75 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -67,8 +67,6 @@ var Zotero = new function(){
 	this.flattenArguments = flattenArguments;
 	this.getAncestorByTagName = getAncestorByTagName;
 	this.join = join;
-	this.arrayToHash = arrayToHash;
-	this.hasValues = hasValues;
 	this.randomString = randomString;
 	this.moveToUnique = moveToUnique;
 	
@@ -1178,31 +1176,6 @@ var Zotero = new function(){
 	}
 	
 	
-	function arrayToHash(array){
-		var hash = {};
-		
-		for each(var val in array){
-			hash[val] = true;
-		}
-		
-		return hash;
-	}
-	
-	
-	/*
-	 * Returns true if an object (or associative array) has at least one value
-	 */
-	function hasValues(obj) {
-		Zotero.debug("WARNING: Zotero.isEmpty() is deprecated! Use Zotero.Utilities.isEmpty(obj)", 2);
-		
-		for (var i in obj) {
-			return true;
-		}
-		
-		return false;
-	}
-	
-	
 	/**
 	* Generate a random string of length 'len' (defaults to 8)
 	**/