diff --git a/content/liberator.js b/content/liberator.js
index 46a95e87..0da3b943 100644
--- a/content/liberator.js
+++ b/content/liberator.js
@@ -127,8 +127,9 @@ const liberator = (function () //{{{
             function ()
             {
                 liberator.open("chrome://mozapps/content/extensions/extensions.xul",
-                    (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("addons") != -1) ?
-                        liberator.NEW_TAB: liberator.CURRENT_TAB);
+                    (liberator.options.newtab &&
+                        (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("addons") != -1)) ?
+                            liberator.NEW_TAB: liberator.CURRENT_TAB);
             });
 
         liberator.commands.add(["beep"],
@@ -192,8 +193,9 @@ const liberator = (function () //{{{
                 if (special) // open javascript console
                 {
                     liberator.open("chrome://global/content/console.xul",
-                        (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("javascript") != -1) ?
-                            liberator.NEW_TAB : liberator.CURRENT_TAB);
+                        (liberator.options.newtab &&
+                            (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("javascript") != -1)) ?
+                                liberator.NEW_TAB : liberator.CURRENT_TAB);
                 }
                 else
                 {
@@ -605,7 +607,7 @@ const liberator = (function () //{{{
 
         help: function(topic)
         {
-            var where = (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("help") != -1) ?
+            var where = (liberator.options.newtab && (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("help") != -1)) ?
                         liberator.NEW_TAB : liberator.CURRENT_TAB;
 
             function jumpToTag(file, tag)
diff --git a/content/muttator.js b/content/muttator.js
index 80e796c8..ccd23235 100644
--- a/content/muttator.js
+++ b/content/muttator.js
@@ -45,10 +45,10 @@ liberator.config = {
     isComposeWindow: false,
 
     dialogs: [
-        /*["about",            "About Firefox", 
-            function() { openDialog("chrome://browser/content/aboutDialog.xul", "_blank", "chrome,dialog,modal,centerscreen"); }],
+        ["about",            "About Thunderbird",  //XXX: Shredder ?
+            function() { openAboutDialog(); }],
         ["addons",           "Manage Add-ons",
-            function() { BrowserOpenAddonsMgr(); }],*/
+            function() { openAddonsMgr(); }],
         ["checkupdates",     "Check for updates",
             function() { checkForUpdates(); }],
         /*["cleardata",        "Clear private data",
diff --git a/content/options.js b/content/options.js
index 27699c4a..b96622fc 100644
--- a/content/options.js
+++ b/content/options.js
@@ -299,8 +299,9 @@ liberator.Options = function () //{{{
                 if (special) // open firefox settings gui dialog
                 {
                     liberator.open("about:config", 
-                        (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("prefs") != -1) ?
-                            liberator.NEW_TAB : liberator.CURRENT_TAB);
+                        (liberator.options.newtab &&
+                            (liberator.options.newtab == "all" || liberator.options.newtab.split(",").indexOf("prefs") != -1)) ?
+                                liberator.NEW_TAB : liberator.CURRENT_TAB);
                 }
                 else
                 {