diff --git a/browser/base/content/browser-places.js b/browser/base/content/browser-places.js
index 933439406b..977852d4e5 100644
--- a/browser/base/content/browser-places.js
+++ b/browser/base/content/browser-places.js
@@ -458,7 +458,8 @@ var PlacesCommandHook = {
    */
   showPlacesOrganizer: function PCH_showPlacesOrganizer(aLeftPaneRoot) {
     var organizer = Services.wm.getMostRecentWindow("Places:Organizer");
-    if (!organizer) {
+    // Due to bug 528706, getMostRecentWindow can return closed windows.
+    if (!organizer || organizer.closed) {
       // No currently open places window, so open one with the specified mode.
       openDialog("chrome://browser/content/places/places.xul", 
                  "", "chrome,toolbar=yes,dialog=no,resizable", aLeftPaneRoot);
diff --git a/browser/components/places/PlacesUIUtils.jsm b/browser/components/places/PlacesUIUtils.jsm
index 968666554f..291c258395 100644
--- a/browser/components/places/PlacesUIUtils.jsm
+++ b/browser/components/places/PlacesUIUtils.jsm
@@ -18,7 +18,9 @@ XPCOMUtils.defineLazyModuleGetter(this, "PluralForm",
 
 XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
                                   "resource://gre/modules/PrivateBrowsingUtils.jsm");
-
+XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
+                                  "resource:///modules/RecentWindow.jsm");
+                                  
 XPCOMUtils.defineLazyGetter(this, "PlacesUtils", function() {
   Cu.import("resource://gre/modules/PlacesUtils.jsm");
   return PlacesUtils;
@@ -397,7 +399,7 @@ this.PlacesUIUtils = {
   },
 
   _getTopBrowserWin: function PUIU__getTopBrowserWin() {
-    return Services.wm.getMostRecentWindow("navigator:browser");
+    return RecentWindow.getMostRecentBrowserWindow();
   },
 
   /**
@@ -542,6 +544,10 @@ this.PlacesUIUtils = {
       // direct non-bookmark children of bookmark folders.
       return !PlacesUtils.nodeIsFolder(parentNode);
     }
+    
+    // Generally it's always possible to remove children of a query.
+    if (PlacesUtils.nodeIsQuery(parentNode))
+      return true;
 
     // Otherwise it has to be a child of an editable folder.
     return !this.isContentsReadOnly(parentNode);
diff --git a/browser/components/places/content/controller.js b/browser/components/places/content/controller.js
index 432289bb2a..331e39354c 100644
--- a/browser/components/places/content/controller.js
+++ b/browser/components/places/content/controller.js
@@ -130,19 +130,20 @@ PlacesController.prototype = {
       return PlacesUtils.transactionManager.numberOfRedoItems > 0;
     case "cmd_cut":
     case "placesCmd_cut":
-      var nodes = this._view.selectedNodes;
-      // If selection includes history nodes there's no reason to allow cut.
-      for (var i = 0; i < nodes.length; i++) {
-        if (nodes[i].itemId == -1)
+    case "placesCmd_moveBookmarks":
+      for (let node of this._view.selectedNodes) {
+        // If selection includes history nodes or tags-as-bookmark, disallow
+        // cutting.
+        if (node.itemId == -1 ||
+            (node.parent && PlacesUtils.nodeIsTagQuery(node.parent))) {
           return false;
+        }
       }
-      // Otherwise fallback to cmd_delete check.
+      // Otherwise fall through to the cmd_delete check.
     case "cmd_delete":
     case "placesCmd_delete":
     case "placesCmd_deleteDataHost":
-      return this._hasRemovableSelection(false);
-    case "placesCmd_moveBookmarks":
-      return this._hasRemovableSelection(true);
+      return this._hasRemovableSelection();
     case "cmd_copy":
     case "placesCmd_copy":
       return this._view.hasSelection;
@@ -298,7 +299,7 @@ PlacesController.prototype = {
    * @returns true if all nodes in the selection can be removed,
    *          false otherwise.
    */
-  _hasRemovableSelection: function PC__hasRemovableSelection(aIsMoveCommand) {
+  _hasRemovableSelection() {
     var ranges = this._view.removableSelectionRanges;
     if (!ranges.length)
       return false;
@@ -1249,7 +1250,7 @@ PlacesController.prototype = {
    *          as part of another operation.
    */
   remove: function PC_remove(aTxnName) {
-    if (!this._hasRemovableSelection(false))
+    if (!this._hasRemovableSelection())
       return;
 
     NS_ASSERT(aTxnName !== undefined, "Must supply Transaction Name");