+ Recommiting changes that got lost.

browser/base/content/tabcandy/app/ui.js

@@ -81,6 +81,29 @@ var Tabbar = {
     $(this.el).animate({"marginTop":0}, speed);
   },
   
+  // ----------
+  // Function: getVisibleTabs
+  // Returns an array of the tabs which are currently visibible in the
+  // tab bar.
+  getVisibleTabs: function(){
+    var visibleTabs = [];
+    // UI.tabBar.el.children is not a real array and does contain
+    // useful functions like filter or forEach. Convert it into a real array.
+    for( var i=0; i<UI.tabBar.el.children.length; i++ ){
+      var tab = UI.tabBar.el.children[i];
+      if( tab.collapsed = false )
+        visibleTabs.push();
+    }
+    
+    return visibleTabs;
+  },
+  
+  // ----------
+  // Function: showOnlyTheseTabs
+  // Hides all of the tabs in the tab bar which are not passed into this function.
+  //
+  // Paramaters
+  //  - An array of <Tab> objects.
   showOnlyTheseTabs: function(tabs){
     var visibleTabs = [];
     // UI.tabBar.el.children is not a real array and does contain
@@ -144,6 +167,14 @@ window.Page = {
       var group = Groups.getActiveGroup();
       if( group && group._children.length == 0 )
         Page.show();
+        
+      // Take care of the case where you've closed the last tab in
+      // an un-named group, which means that the group is gone (null) and
+      // there are no visible tabs.
+      if( group == null && Tabbar.getVisibleTabs().length == 0){
+        Page.show();
+      }
+        
       return false;
     });