diff --git a/common/content/contexts.js b/common/content/contexts.js
index bed6f126..b1494f3f 100644
--- a/common/content/contexts.js
+++ b/common/content/contexts.js
@@ -130,11 +130,14 @@ var Contexts = Module("contexts", {
         this.builtinGroups = [this.builtin, this.user];
     },
 
-    destroy: function () {
-        for (let hive in values(this.groupList)) {
+    cleanup: function () {
+        for (let hive in values(this.groupList))
             dactyl.trapErrors("cleanup", hive);
+    },
+
+    destroy: function () {
+        for (let hive in values(this.groupList))
             dactyl.trapErrors("destroy", hive);
-        }
 
         for (let plugin in values(plugins.contexts))
             if (plugin.onUnload)
@@ -191,8 +194,7 @@ var Contexts = Module("contexts", {
         if (group) {
             name = group.name;
             this.groupList.splice(this.groupList.indexOf(group), 1);
-            group.cleanup();
-            group.destroy();
+            dactyl.trapErrors("destroy", group);
         }
 
         if (this.context && this.context.group === group)
@@ -295,18 +297,25 @@ var Contexts = Module("contexts", {
         }
         else {
             let name = isPlugin ? file.getRelativeDescriptor(isPlugin).replace(File.PATH_SEP, "-") : file.leafName;
+
             self = update(modules.newContext.apply(null, args || [userContext]), {
                 NAME: Const(name.replace(/\..*/, "").replace(/-([a-z])/g, function (m, n1) n1.toUpperCase())),
+
                 PATH: Const(file.path),
+
                 CONTEXT: Const(self),
+
                 unload: Const(function unload() {
                     if (plugins[this.NAME] === this || plugins[this.PATH] === this)
                         if (this.onUnload)
                             this.onUnload();
+
                     if (plugins[this.NAME] === this)
                         delete plugins[this.NAME];
+
                     if (plugins[this.PATH] === this)
                         delete plugins[this.PATH];
+
                     if (!this.GROUP.builtin)
                         contexts.removeGroup(this.GROUP);
                 })
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index 12f3c9be..614b0aa7 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -61,6 +61,8 @@ if (!Object.defineProperties)
         for (let [k, v] in Iterator(props))
             Object.defineProperty(obj, k, v);
     }
+if (!Object.freeze)
+    Object.freeze = function freeze(obj) {};
 if (!Object.getOwnPropertyDescriptor)
     Object.getOwnPropertyDescriptor = function getOwnPropertyDescriptor(obj, prop) {
         if (!hasOwnProperty.call(obj, prop))
@@ -101,13 +103,15 @@ if (!Object.keys)
     Object.keys = function keys(obj)
         Object.getOwnPropertyNames(obj).filter(function (k) objproto.propertyIsEnumerable.call(obj, k));
 
+let getGlobalForObject = Cu.getGlobalForObject || function (obj) obj.__parent__;
+
 let use = {};
 let loaded = {};
 let currentModule;
 let global = this;
 function defineModule(name, params, module) {
     if (!module)
-        module = Cu.getGlobalForObject ? Cu.getGlobalForObject(params) : params.__parent__;
+        module = getGlobalForObject(params);
 
     module.NAME = name;
     module.EXPORTED_SYMBOLS = params.exports || [];
diff --git a/common/modules/highlight.jsm b/common/modules/highlight.jsm
index 02d8e15b..dbe669d4 100644
--- a/common/modules/highlight.jsm
+++ b/common/modules/highlight.jsm
@@ -23,8 +23,7 @@ Highlight.liveProperty = function (name, prop) {
                 val = Array.slice(val);
             else
                 val = update({}, val);
-            if (Object.freeze)
-                Object.freeze(val);
+            Object.freeze(val);
         }
         this.set(name, val);
 
diff --git a/common/modules/styles.jsm b/common/modules/styles.jsm
index aebdc528..c9f59d6d 100644
--- a/common/modules/styles.jsm
+++ b/common/modules/styles.jsm
@@ -23,7 +23,7 @@ Sheet.liveProperty = function (name) {
     this.prototype.__defineSetter__(name, function (val) {
         if (isArray(val))
             val = Array.slice(val);
-        if (isArray(val) && Object.freeze)
+        if (isArray(val))
             Object.freeze(val);
         this[i] = val;
         this.enabled = this.enabled;
@@ -87,13 +87,25 @@ var Hive = Class("Hive", {
         this.name = name;
         this.sheets = [];
         this.names = {};
+        this.refs = [];
+    },
+
+    addRef: function (obj) {
+        this.refs.push(Cu.getWeakReference(obj));
+        this.dropRef(null);
+    },
+    dropRef: function (obj) {
+        this.refs = this.refs.filter(function (ref) ref.get() && ref.get() !== obj);
+        if (!this.refs.length) {
+            this.cleanup();
+            styles.hives = styles.hives.filter(function (h) h !== this, this);
+        }
     },
 
     cleanup: function cleanup() {
         for (let sheet in values(this.sheets))
             sheet.enabled = false;
     },
-    destroy: function destroy() {},
 
     __iterator__: function () Iterator(this.sheets),
 
@@ -220,7 +232,6 @@ var Hive = Class("Hive", {
     },
 });
 
-try {
 /**
  * Manages named and unnamed user style sheets, which apply to both
  * chrome and content pages.
@@ -230,7 +241,6 @@ try {
 var Styles = Module("Styles", {
     init: function () {
         this._id = 0;
-        this.hives = [];
         this.cleanup();
         this.allSheets = {};
 
@@ -244,17 +254,20 @@ var Styles = Module("Styles", {
 
     cleanup: function cleanup() {
         for each (let hive in this.hives)
-            hive.cleanup();
-        this.user = this.addHive("user");
-        this.system = this.addHive("system");
+            util.trapErrors("cleanup", hive);
+        this.hives = [];
+        this.user = this.addHive("user", this);
+        this.system = this.addHive("system", this);
     },
 
-    addHive: function addHive(name) {
+    addHive: function addHive(name, ref) {
         let hive = array.nth(this.hives, function (h) h.name === name, 0);
         if (!hive) {
             hive = Hive(name);
             this.hives.push(hive);
         }
+        if (ref)
+            hive.addRef(ref);
         return hive;
     },
 
@@ -601,7 +614,23 @@ var Styles = Module("Styles", {
         });
     },
     contexts: function (dactyl, modules, window) {
-        modules.Group.Hives("styles", function (group) styles.addHive(group.name));
+        modules.Group.Hives("styles",
+            Class("LocalHive", modules.Group.Hive, {
+                init: function init(group) {
+                    init.superapply(this, arguments);
+
+                    this.hive = styles.addHive(group.name);
+                    this.hive.addRef(this);
+                },
+
+                __noSuchMethod__: function __noSuchMethod__(meth, args) {
+                    return this.hive[meth].apply(this.hive, args);
+                },
+
+                destroy: function () {
+                    this.hive.dropRef(this);
+                }
+            }));
     },
     completion: function (dactyl, modules, window) {
         const names = Array.slice(util.computedStyle(window.document.createElement("div")));
@@ -658,6 +687,6 @@ var Styles = Module("Styles", {
 
 endModule();
 
-} catch(e){dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack);}
+// catch(e){dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack);}
 
 // vim: set fdm=marker sw=4 ts=4 et ft=javascript: