diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index e61fd78a7..6cfb909c3 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -2396,6 +2396,8 @@ Zotero.DragDrop = {
  * Functions for creating and destroying hidden browser objects
  **/
 Zotero.Browser = new function() {
+	var nBrowsers = 0;
+	
 	this.createHiddenBrowser = createHiddenBrowser;
 	this.deleteHiddenBrowser = deleteHiddenBrowser;
 	
@@ -2423,8 +2425,7 @@ Zotero.Browser = new function() {
 		hiddenBrowser.docShell.allowJavascript = true;
 		hiddenBrowser.docShell.allowMetaRedirects = false;
 		hiddenBrowser.docShell.allowPlugins = false;
-		Zotero.debug("Created hidden browser ("
-			+ (win.document.getElementsByTagName('browser').length - 1) + ")");
+		Zotero.debug("Created hidden browser (" + (nBrowsers++) + ")");
 		return hiddenBrowser;
 	}
 	
@@ -2436,8 +2437,7 @@ Zotero.Browser = new function() {
 			myBrowser.destroy();
 			myBrowser.parentNode.removeChild(myBrowser);
 			myBrowser = null;
-			Zotero.debug("Deleted hidden browser ("
-				+ (win.document.getElementsByTagName('browser').length - 1) + ")");
+			Zotero.debug("Deleted hidden browser (" + (--nBrowsers) + ")");
 		}
 	}
 }