diff --git a/chrome/content/zotero/elements/textLink.js b/chrome/content/zotero/elements/textLink.js
index 86d4831a25..90df930011 100644
--- a/chrome/content/zotero/elements/textLink.js
+++ b/chrome/content/zotero/elements/textLink.js
@@ -82,7 +82,7 @@
 
 			// otherwise, fall back to opening the anchor directly
 			var win = window;
-			if (window instanceof Components.interfaces.nsIDOMChromeWindow) {
+			if (win.isChromeWindow) {
 				while (win.opener && !win.opener.closed)
 					win = win.opener;
 			}
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 46b1b58bb6..811f31cde4 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -3020,7 +3020,7 @@ var ZoteroPane = new function()
 		}
 		
 		// Restore window if it's in the dock
-		if (window.windowState == Components.interfaces.nsIDOMChromeWindow.STATE_MINIMIZED) {
+		if (window.windowState == window.STATE_MINIMIZED) {
 			window.restore();
 		}