diff --git a/chrome/content/tabutils-pt.js b/chrome/content/tabutils-pt.js
index 271d80d..7cb6dc3 100644
--- a/chrome/content/tabutils-pt.js
+++ b/chrome/content/tabutils-pt.js
@@ -57,8 +57,8 @@ tabutils._phantomTabs = function() {
       }
 
       if (!aRestoring) {
-        tabutils._ss.setTabValue(aTab, "pinned", true);
-        tabutils._ss.setTabValue(aTab, "bookmarkId", aTab.bookmarkId);
+        tabutils._ss.setTabValue(aTab, "pinned", "true");
+        tabutils._ss.setTabValue(aTab, "bookmarkId", String(aTab.bookmarkId || "")); // Bug 961646
       }
       aTab.dispatchEvent(new CustomEvent("TabPinning", {bubbles: true}));
 
diff --git a/chrome/content/tabutils.js b/chrome/content/tabutils.js
index d93dea4..cb83129 100644
--- a/chrome/content/tabutils.js
+++ b/chrome/content/tabutils.js
@@ -587,6 +587,34 @@ tabutils._tabOpeningOptions = function() {
     }
   });
 
+  let tmp = {};
+  Cu.import("resource://gre/modules/DownloadLastDir.jsm", tmp);
+
+  if (tmp.DownloadLastDir && // Bug 722995 [Fx19]
+      tmp.DownloadLastDir.prototype.getFileAsync && // Bug 854299 [Fx23]
+      tmp.DownloadLastDir.prototype.getFileAsync.name != "TU_getFileAsync")
+  tmp.DownloadLastDir.prototype.getFileAsync = (function() {
+    let getFileAsync = tmp.DownloadLastDir.prototype.getFileAsync;
+    return function TU_getFileAsync(aURI, aCallback) {
+      let win = this.window;
+      if (win._closeTimer) {
+        win.clearTimeout(win._closeTimer);
+        win._closeTimer = null;
+
+        aCallback = (function() {
+          let lastDirCallback = aCallback;
+          return function TU_LastDirCallback(lastDir) {
+            lastDirCallback(lastDir);
+            if (!win.closed) {
+              win.setTimeout(win.close, 250);
+            }
+          };
+        })();
+      }
+      getFileAsync.apply(this, arguments);
+    };
+  })();
+
   //在当前标签页的右侧打开新标签页
   //连续打开后台标签时保持原有顺序
   TU_hookCode("gBrowser.addTab",
diff --git a/chrome/content/unknownContentType.xul b/chrome/content/unknownContentType.xul
index aceb7b0..f342b13 100644
--- a/chrome/content/unknownContentType.xul
+++ b/chrome/content/unknownContentType.xul
@@ -1,62 +1,14 @@
 <?xml version="1.0"?>
 <overlay id="tabutils-unknownContentType" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-  <script type="application/javascript" src="tulib.js"/>
   <script type="application/javascript">
   <![CDATA[
     var win = window.opener;
     if (win && win._closeTimer) {
       win.clearTimeout(win._closeTimer);
-
-      function isUsableDirectory(aDirectory)
-      {
-        return aDirectory.exists() && aDirectory.isDirectory() &&
-               aDirectory.isWritable();
-      }
-
-      const PREF_BD_USEDOWNLOADDIR = "browser.download.useDownloadDir";
-      const nsITimer = Components.interfaces.nsITimer;
-
-      try {
-        var downloadModule = {};
-        Components.utils.import("resource://gre/modules/DownloadLastDir.jsm", downloadModule); // Bug 722995 [Fx19]
-        Components.utils.import("resource://gre/modules/DownloadLastDir.jsm");
-        Components.utils.import("resource://gre/modules/Downloads.jsm");
-        Components.utils.import("resource://gre/modules/FileUtils.jsm");
-        Components.utils.import("resource://gre/modules/Services.jsm");
-        Components.utils.import("resource://gre/modules/Task.jsm");
-      } catch (e) {}
-
-      if ("promptForSaveToFileAsync" in dialog) // Bug 854299 [Fx23]
-      TU_hookCode("dialog.promptForSaveToFileAsync", /.*saveDestinationAvailable.*/g, function(s) (function() {
-        {
-          $0;
-          aContext.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                  .getInterface(Components.interfaces.nsIDOMWindow)
-                  .close();
-        }
-      }).toString().replace(/^.*{|}$/g, "").replace("$0", s));
-
-      TU_hookCode("dialog.promptForSaveToFile", /(return;|return null;|return result;)/g, function(s) (function() {
-        {
-          aContext.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                  .getInterface(Components.interfaces.nsIDOMWindow)
-                  .close();
-          $0;
-        }
-      }).toString().replace(/^.*{|}$/g, "").replace("$0", s));
-
-      TU_hookCode("dialog.onOK", /(?=return true;)/, function() {
-        if (!this._saveToDiskTimer)
-        this.mContext.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                     .getInterface(Components.interfaces.nsIDOMWindow)
-                     .close();
-      });
-
-      TU_hookCode("dialog.onCancel", /(?=return true;)/, function() {
-        this.mContext.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                     .getInterface(Components.interfaces.nsIDOMWindow)
-                     .close();
-      });
+      window.addEventListener("unload", function() {
+        if (win._closeTimer && !win.closed)
+          win._closeTimer = win.setTimeout(win.close, 250);
+      }, false);
     }
   ]]>
   </script>