diff --git a/chrome/content/zotero/longTagFixer.js b/chrome/content/zotero/longTagFixer.js
index 331a75ab4..5b559d560 100644
--- a/chrome/content/zotero/longTagFixer.js
+++ b/chrome/content/zotero/longTagFixer.js
@@ -157,7 +157,7 @@ var Zotero_Long_Tag_Fixer = new function () {
 			case 0:
 				// Get checked tags
 				var listbox = document.getElementById('zotero-new-tag-list');
-				var len = Zotero.isFx3 ? listbox.childNodes.length : listbox.childElementCount;
+				var len = listbox.childElementCount;
 				var newTags = [];
 				for (var i=0; i<len; i++) {
 					var li = listbox.childNodes[i];
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 9a2d3e03e..d0d900d15 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -238,12 +238,6 @@ Components.utils.import("resource://gre/modules/Services.jsm");
 		this.platformVersion = appInfo.platformVersion;
 		this.platformMajorVersion = parseInt(appInfo.platformVersion.match(/^[0-9]+/)[0]);
 		this.isFx = true;
-		this.isFx3 = false;
-		this.isFx35 = false;
-		this.isFx31 = false;
-		this.isFx36 = false;
-		this.isFx4 = true;
-		this.isFx5 = true;
 		
 		this.isStandalone = appInfo.ID == ZOTERO_CONFIG['GUID'];
 		if(this.isStandalone) {