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diff --git a/application/basilisk/components/sessionstore/GlobalState.jsm b/application/basilisk/components/sessionstore/GlobalState.jsm
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+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["GlobalState"];
+
+const EXPORTED_METHODS = ["getState", "clear", "get", "set", "delete", "setFromState"];
+/**
+ * Module that contains global session data.
+ */
+function GlobalState() {
+ let internal = new GlobalStateInternal();
+ let external = {};
+ for (let method of EXPORTED_METHODS) {
+ external[method] = internal[method].bind(internal);
+ }
+ return Object.freeze(external);
+}
+
+function GlobalStateInternal() {
+ // Storage for global state.
+ this.state = {};
+}
+
+GlobalStateInternal.prototype = {
+ /**
+ * Get all value from the global state.
+ */
+ getState: function() {
+ return this.state;
+ },
+
+ /**
+ * Clear all currently stored global state.
+ */
+ clear: function() {
+ this.state = {};
+ },
+
+ /**
+ * Retrieve a value from the global state.
+ *
+ * @param aKey
+ * A key the value is stored under.
+ * @return The value stored at aKey, or an empty string if no value is set.
+ */
+ get: function(aKey) {
+ return this.state[aKey] || "";
+ },
+
+ /**
+ * Set a global value.
+ *
+ * @param aKey
+ * A key to store the value under.
+ */
+ set: function(aKey, aStringValue) {
+ this.state[aKey] = aStringValue;
+ },
+
+ /**
+ * Delete a global value.
+ *
+ * @param aKey
+ * A key to delete the value for.
+ */
+ delete: function(aKey) {
+ delete this.state[aKey];
+ },
+
+ /**
+ * Set the current global state from a state object. Any previous global
+ * state will be removed, even if the new state does not contain a matching
+ * key.
+ *
+ * @param aState
+ * A state object to extract global state from to be set.
+ */
+ setFromState: function (aState) {
+ this.state = (aState && aState.global) || {};
+ }
+};