diff --git a/chrome/content/zotero/standalone/standalone.js b/chrome/content/zotero/standalone/standalone.js
index 5e45327ec9..5be7f90a3a 100644
--- a/chrome/content/zotero/standalone/standalone.js
+++ b/chrome/content/zotero/standalone/standalone.js
@@ -121,38 +121,6 @@ const ZoteroStandalone = new function() {
 		}
 	}
 	
-	/**
-	 * Opens a URL in the basic viewer, and optionally run a callback on load
-	 *
-	 * @param {String} uri
-	 * @param {Function} [onLoad] - Function to run once URI is loaded; passed the loaded document
-	 */
-	this.openInViewer = function(uri, onLoad) {
-		var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"]
-			.getService(Components.interfaces.nsIWindowMediator);
-		var win = wm.getMostRecentWindow("zotero:basicViewer");
-		if(win) {
-			win.loadURI(uri);
-		} else {
-			win = window.openDialog("chrome://zotero/content/standalone/basicViewer.xul",
-				"basicViewer", "chrome,resizable,centerscreen,menubar,scrollbars", uri);
-		}
-		if (onLoad) {
-			let browser
-			let func = function () {
-				win.removeEventListener("load", func);
-				browser = win.document.documentElement.getElementsByTagName('browser')[0];
-				browser.addEventListener("pageshow", innerFunc);
-			};
-			let innerFunc = function () {
-				browser.removeEventListener("pageshow", innerFunc);
-				onLoad(browser.contentDocument);
-			};
-			win.addEventListener("load", func);
-			
-		}
-	}
-	
 	this.updateAddonsPane = function (doc) {
 		// Hide unsigned add-on verification warnings
 		//
diff --git a/chrome/content/zotero/standalone/standalone.xul b/chrome/content/zotero/standalone/standalone.xul
index fe9cfa5c5a..bf42f2e9ab 100644
--- a/chrome/content/zotero/standalone/standalone.xul
+++ b/chrome/content/zotero/standalone/standalone.xul
@@ -168,7 +168,7 @@
 									command="cmd_zotero_rtfScan"/>
 							<menuseparator/>
 							<menuitem id="menu_addons" label="&addons.label;"
-									oncommand="ZoteroStandalone.openInViewer('chrome://mozapps/content/extensions/extensions.xul', ZoteroStandalone.updateAddonsPane)"/>
+									oncommand="Zotero.openInViewer('chrome://mozapps/content/extensions/extensions.xul', ZoteroStandalone.updateAddonsPane)"/>
 							<!--<menuitem label="Error Console" oncommand="toJavaScriptConsole()"/>-->
 						</menupopup>
 					</menu>
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 19f031af5a..f896833ccd 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -992,6 +992,38 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 	}
 	
 	
+	/**
+	 * Opens a URL in the basic viewer, and optionally run a callback on load
+	 *
+	 * @param {String} uri
+	 * @param {Function} [onLoad] - Function to run once URI is loaded; passed the loaded document
+	 */
+	this.openInViewer = function (uri, onLoad) {
+		var wm = Services.wm;
+		var win = wm.getMostRecentWindow("zotero:basicViewer");
+		if (win) {
+			win.loadURI(uri);
+		} else {
+			let window = wm.getMostRecentWindow("navigator:browser");
+			win = window.openDialog("chrome://zotero/content/standalone/basicViewer.xul",
+				"basicViewer", "chrome,resizable,centerscreen,menubar,scrollbars", uri);
+		}
+		if (onLoad) {
+			let browser
+			let func = function () {
+				win.removeEventListener("load", func);
+				browser = win.document.documentElement.getElementsByTagName('browser')[0];
+				browser.addEventListener("pageshow", innerFunc);
+			};
+			let innerFunc = function () {
+				browser.removeEventListener("pageshow", innerFunc);
+				onLoad(browser.contentDocument);
+			};
+			win.addEventListener("load", func);
+		}
+	};
+	
+	
 	/*
 	 * Debug logging function
 	 *
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index b0dad34349..1d4c944dd6 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -3195,7 +3195,7 @@ var ZoteroPane = new function()
 				if(uri.match(/^https?/)) {
 					this.launchURL(uri);
 				} else {
-					ZoteroStandalone.openInViewer(uri);
+					Zotero.openInViewer(uri);
 				}
 				return;
 			}