diff --git a/common/content/commandline.js b/common/content/commandline.js
index 3edfbbe4..dc9e6586 100644
--- a/common/content/commandline.js
+++ b/common/content/commandline.js
@@ -1000,11 +1000,10 @@ var CommandLine = Module("commandline", {
             if (privateData == "never-save")
                 return;
 
-            this.store = this.store.filter(line => (line.value || line) != str);
-            dactyl.trapErrors(function () {
-                this.store.push({ value: str, timestamp: Date.now() * 1000, privateData: privateData });
-            }, this);
-            this.store = this.store.slice(Math.max(0, this.store.length - options["history"]));
+            let store = Array.filter(this.store, line => (line.value || line) != str);
+            dactyl.trapErrors(
+                () => store.push({ value: str, timestamp: Date.now() * 1000, privateData: privateData }));
+            this.store = store.slice(Math.max(0, store.length - options["history"]));
         },
         /**
          * @property {function} Returns whether a data item should be
diff --git a/common/content/marks.js b/common/content/marks.js
index 8bb37916..154ac252 100644
--- a/common/content/marks.js
+++ b/common/content/marks.js
@@ -63,7 +63,8 @@ var Marks = Module("marks", {
         let mark = this.Mark();
 
         if (Marks.isURLMark(name)) {
-            mark.tab = util.weakReference(tabs.getTab());
+            // FIXME: Disabled due to cross-compartment magic.
+            // mark.tab = util.weakReference(tabs.getTab());
             this._urlMarks.set(name, mark);
             var message = "mark.addURL";
         }
diff --git a/common/modules/storage.jsm b/common/modules/storage.jsm
index 4229408f..fd8f7924 100644
--- a/common/modules/storage.jsm
+++ b/common/modules/storage.jsm
@@ -18,6 +18,8 @@ lazyRequire("resource://gre/modules/osfile.jsm", ["OS"]);
 var win32 = /^win(32|nt)$/i.test(services.runtime.OS);
 var myObject = JSON.parse("{}").constructor;
 
+var global = Cu.getGlobalForObject(this);
+
 var StoreBase = Class("StoreBase", {
     OPTIONS: ["privateData", "replacer"],
 
@@ -25,7 +27,7 @@ var StoreBase = Class("StoreBase", {
 
     get serial() JSON.stringify(this._object, this.replacer),
 
-    init: function (name, store, load, options) {
+    init: function init(name, store, load, options) {
         this._load = load;
         this._options = options;
 
@@ -37,13 +39,21 @@ var StoreBase = Class("StoreBase", {
         this.reload();
     },
 
-    clone: function (storage) {
+    clone: function clone(storage) {
         let store = storage.privateMode ? false : this.store;
         let res = this.constructor(this.name, store, this._load, this._options);
         res.storage = storage;
         return res;
     },
 
+    makeOwn: function makeOwn(val) {
+        if (typeof val != "object")
+            return val;
+        if (Cu.getGlobalForObject(val) == global)
+            return val;
+        return JSON.parse(JSON.stringify(val, this.replacer));
+    },
+
     changed: function () { this.timer && this.timer.tell(); },
 
     reload: function reload() {
@@ -70,7 +80,7 @@ var ArrayStore = Class("ArrayStore", StoreBase, {
 
     set: function set(index, value, quiet) {
         var orig = this._object[index];
-        this._object[index] = value;
+        this._object[index] = this.makeOwn(value);
         if (!quiet)
             this.fireEvent("change", index);
 
@@ -78,7 +88,7 @@ var ArrayStore = Class("ArrayStore", StoreBase, {
     },
 
     push: function push(value) {
-        this._object.push(value);
+        this._object.push(this.makeOwn(value));
         this.fireEvent("push", this._object.length);
     },
 
@@ -99,6 +109,7 @@ var ArrayStore = Class("ArrayStore", StoreBase, {
     },
 
     insert: function insert(value, ord) {
+        value = this.makeOwn(value);
         if (ord == 0)
             this._object.unshift(value);
         else
@@ -123,7 +134,8 @@ var ArrayStore = Class("ArrayStore", StoreBase, {
     mutate: function mutate(funcName) {
         var _funcName = funcName;
         arguments[0] = this._object;
-        this._object = Array[_funcName].apply(Array, arguments);
+        this._object = Array[_funcName].apply(Array, arguments)
+                                       .map(this.makeOwn.bind(this));
         this.fireEvent("change", null);
     },
 
@@ -158,7 +170,7 @@ var ObjectStore = Class("ObjectStore", StoreBase, {
     set: function set(key, val) {
         var defined = key in this._object;
         var orig = this._object[key];
-        this._object[key] = val;
+        this._object[key] = this.makeOwn(val);
         if (!defined)
             this.fireEvent("add", key);
         else if (orig != val)