diff -r 000000000000 -r 6474c204b198 toolkit/components/contentprefs/ContentPrefStore.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/contentprefs/ContentPrefStore.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,124 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let EXPORTED_SYMBOLS = [
+  "ContentPrefStore",
+];
+
+function ContentPrefStore() {
+  this._groups = {};
+  this._globalNames = {};
+}
+
+ContentPrefStore.prototype = {
+
+  set: function CPS_set(group, name, val) {
+    if (group) {
+      if (!this._groups.hasOwnProperty(group))
+        this._groups[group] = {};
+      this._groups[group][name] = val;
+    }
+    else {
+      this._globalNames[name] = val;
+    }
+  },
+
+  setWithCast: function CPS_setWithCast(group, name, val) {
+    if (typeof(val) == "boolean")
+      val = val ? 1 : 0;
+    else if (val === undefined)
+      val = null;
+    this.set(group, name, val);
+  },
+
+  has: function CPS_has(group, name) {
+    return (group &&
+            this._groups.hasOwnProperty(group) &&
+            this._groups[group].hasOwnProperty(name)) ||
+           (!group &&
+            this._globalNames.hasOwnProperty(name));
+  },
+
+  get: function CPS_get(group, name) {
+    if (group) {
+      if (this._groups.hasOwnProperty(group) &&
+          this._groups[group].hasOwnProperty(name))
+        return this._groups[group][name];
+    }
+    else if (this._globalNames.hasOwnProperty(name)) {
+      return this._globalNames[name];
+    }
+    return undefined;
+  },
+
+  remove: function CPS_remove(group, name) {
+    if (group) {
+      if (this._groups.hasOwnProperty(group)) {
+        delete this._groups[group][name];
+        if (!Object.keys(this._groups[group]).length)
+          delete this._groups[group];
+      }
+    }
+    else {
+      delete this._globalNames[name];
+    }
+  },
+
+  removeGroup: function CPS_removeGroup(group) {
+    if (group) {
+      delete this._groups[group];
+    }
+    else {
+      this._globalNames = {};
+    }
+  },
+
+  removeAllGroups: function CPS_removeAllGroups() {
+    this._groups = {};
+  },
+
+  removeAll: function CPS_removeAll() {
+    this.removeAllGroups();
+    this._globalNames = {};
+  },
+
+  __iterator__: function CPS___iterator__() {
+    for (let [group, names] in Iterator(this._groups)) {
+      for (let [name, val] in Iterator(names)) {
+        yield [group, name, val];
+      }
+    }
+    for (let [name, val] in Iterator(this._globalNames)) {
+      yield [null, name, val];
+    }
+  },
+
+  match: function CPS_match(group, name, includeSubdomains) {
+    for (let sgroup in this.matchGroups(group, includeSubdomains)) {
+      if (this.has(sgroup, name))
+        yield [sgroup, this.get(sgroup, name)];
+    }
+  },
+
+  matchGroups: function CPS_matchGroups(group, includeSubdomains) {
+    if (group) {
+      if (includeSubdomains) {
+        for (let [sgroup, , ] in this) {
+          if (sgroup) {
+            let idx = sgroup.indexOf(group);
+            if (idx == sgroup.length - group.length &&
+                (idx == 0 || sgroup[idx - 1] == "."))
+              yield sgroup;
+          }
+        }
+      }
+      else if (this._groups.hasOwnProperty(group)) {
+        yield group;
+      }
+    }
+    else if (Object.keys(this._globalNames).length) {
+      yield null;
+    }
+  },
+};