diff --git a/common/modules/contexts.jsm b/common/modules/contexts.jsm
index 7c3b72e3..f04968b3 100644
--- a/common/modules/contexts.jsm
+++ b/common/modules/contexts.jsm
@@ -151,9 +151,13 @@ var Contexts = Module("contexts", {
             for each (let hive in values(this.groupList.slice()))
                 util.trapErrors("destroy", hive, "shutdown");
 
-            for (let [name, plugin] in iter(this.modules.plugins.contexts))
+            for each (let plugin in this.modules.plugins.contexts) {
                 if (plugin && "onUnload" in plugin && callable(plugin.onUnload))
                     util.trapErrors("onUnload", plugin);
+
+                if (isinstance(plugin, ["Sandbox"]))
+                    util.trapErrors("nukeSandbox", Cu, plugin);
+            }
         },
 
         signals: {
diff --git a/common/modules/main.jsm b/common/modules/main.jsm
index 7d9c8731..0547bda6 100644
--- a/common/modules/main.jsm
+++ b/common/modules/main.jsm
@@ -89,12 +89,30 @@ var Modules = function Modules(window) {
     Module.list = [];
     Module.constructors = {};
 
-    const create = window.Object.create.bind(window.Object);
+    function newContext(proto, normal, name) {
+        if (normal)
+            return create(proto);
+
+        sandbox = Components.utils.Sandbox(window, { sandboxPrototype: proto || modules,
+                                                     sandboxName: name || ("Dactyl Sandbox " + ++_id),
+                                                     wantXrays: false });
+
+        // Hack:
+        // sandbox.Object = jsmodules.Object;
+        sandbox.File = jsmodules.File;
+        sandbox.Math = jsmodules.Math;
+        sandbox.Set = jsmodules.Set;
+        return sandbox;
+    };
+
 
     const BASES = [BASE, "resource://dactyl-local-content/"];
 
-    jsmodules = Cu.createObjectIn(window);
+    jsmodules = newContext(window, false, "Dactyl `jsmodules`");
     jsmodules.NAME = "jsmodules";
+
+    const create = bind("create", jsmodules.Object);
+
     const modules = update(create(jsmodules), {
         yes_i_know_i_should_not_report_errors_in_these_branches_thanks: [],
 
@@ -130,21 +148,7 @@ var Modules = function Modules(window) {
             }
         },
 
-        newContext: function newContext(proto, normal, name) {
-            if (normal)
-                return create(proto);
-
-            sandbox = Components.utils.Sandbox(window, { sandboxPrototype: proto || modules,
-                                                         sandboxName: name || ("Dactyl Sandbox " + ++_id),
-                                                         wantXrays: false });
-
-            // Hack:
-            // sandbox.Object = jsmodules.Object;
-            sandbox.File = jsmodules.File;
-            sandbox.Math = jsmodules.Math;
-            sandbox.Set = jsmodules.Set;
-            return sandbox;
-        },
+        newContext: newContext,
 
         get ownPropertyValues() array.compact(
                 Object.getOwnPropertyNames(this)
@@ -166,6 +170,7 @@ overlay.overlayWindow(Object.keys(config.overlays),
         const modules = Modules(window);
         modules.moduleManager = this;
         this.modules = modules;
+        this.jsmodules = modules.jsmodules;
 
         window.dactyl = { modules: modules };
 
@@ -225,6 +230,8 @@ overlay.overlayWindow(Object.keys(config.overlays),
 
     cleanup: function cleanup(window) {
         overlay.windows = overlay.windows.filter(w => w != window);
+
+        Cu.nukeSandbox(this.jsmodules);
     },
 
     unload: function unload(window) {
diff --git a/common/modules/sanitizer.jsm b/common/modules/sanitizer.jsm
index 057d6d5f..30bebda7 100644
--- a/common/modules/sanitizer.jsm
+++ b/common/modules/sanitizer.jsm
@@ -247,6 +247,11 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
             if (!("value" in prop) || !callable(prop.value) && !(k in item))
                 Object.defineProperty(item, k, prop);
 
+        function getWindow(obj) {
+            obj = Class.objectGlobal(obj);
+            return obj.window || obj;
+        }
+
         let names = RealSet([name].concat(params.contains || []).map(e => "clear-" + e));
         if (params.action)
             storage.addObserver("sanitizer",
@@ -254,7 +259,7 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
                     if (names.has(event))
                         params.action.apply(params, arg);
                 },
-                Class.objectGlobal(params.action));
+                getWindow(params.action));
 
         if (params.privateEnter || params.privateLeave)
             storage.addObserver("private-mode",
@@ -263,7 +268,7 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
                     if (meth)
                         meth.call(params);
                 },
-                Class.objectGlobal(params.action));
+                getWindow(params.privateEnter || params.privateLeave));
     },
 
     observers: {
diff --git a/common/modules/storage.jsm b/common/modules/storage.jsm
index 6cc704f0..b488a244 100644
--- a/common/modules/storage.jsm
+++ b/common/modules/storage.jsm
@@ -1,4 +1,4 @@
-// Copyright (c) 2008-2013 Kris Maglione <maglione.k at Gmail>
+// Copyright (c) 2008-2014 Kris Maglione <maglione.k at Gmail>
 //
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.