diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index b593662c9..0e00b5260 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -1710,6 +1710,7 @@ Zotero.Browser = new function() {
 		
 		// Create a hidden browser
 		var hiddenBrowser = win.document.createElement("browser");
+		hiddenBrowser.setAttribute('type', 'content');
 		hiddenBrowser.setAttribute('disablehistory', 'true');
 		win.document.documentElement.appendChild(hiddenBrowser);
 		Zotero.debug("created hidden browser ("