diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
new file mode 100644
index 0000000..a80bc51
--- /dev/null
+++ b/platform/firefox/vapi-background.js
@@ -0,0 +1,181 @@
+/*******************************************************************************
+
+    µBlock - a Chromium browser extension to block requests.
+    Copyright (C) 2014 The µBlock authors
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* global Services */
+
+// For background page
+
+/******************************************************************************/
+
+(function() {
+
+'use strict';
+
+/******************************************************************************/
+
+const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu['import']('resource://gre/modules/Services.jsm');
+
+/******************************************************************************/
+
+self.vAPI = self.vAPI || {};
+
+vAPI.firefox = true;
+
+/******************************************************************************/
+
+vAPI.messaging = {
+    gmm: Cc['@mozilla.org/globalmessagemanager;1'].getService(Ci.nsIMessageListenerManager),
+    frameScript: 'chrome://ublock/content/frameScript.js',
+    listeners: {},
+    defaultHandler: null,
+    NOOPFUNC: function(){},
+    UNHANDLED: 'vAPI.messaging.notHandled'
+};
+
+/******************************************************************************/
+
+vAPI.messaging.gmm.loadFrameScript(vAPI.messaging.frameScript, true);
+
+/******************************************************************************/
+
+vAPI.messaging.listen = function(listenerName, callback) {
+    this.listeners[listenerName] = callback;
+};
+
+/******************************************************************************/
+
+vAPI.messaging.onMessage = function(request) {
+    var messageManager = request.target.messageManager;
+    var listenerId = request.data.portName.split('|');
+    var portName = listenerId[1];
+    listenerId = listenerId[0];
+
+    var callback = vAPI.messaging.NOOPFUNC;
+    if ( request.data.requestId !== undefined ) {
+        callback = function(response) {
+            messageManager.sendAsyncMessage(
+                listenerId,
+                JSON.stringify({
+                    requestId: request.data.requestId,
+                    portName: portName,
+                    msg: response !== undefined ? response : null
+                })
+            );
+        };
+    }
+
+    // TODO:
+    var sender = {
+        tab: {
+            id: 0
+        }
+    };
+
+    // Specific handler
+    var r = vAPI.messaging.UNHANDLED;
+    var listener = vAPI.messaging.listeners[portName];
+    if ( typeof listener === 'function' ) {
+        r = listener(request.data.msg, sender, callback);
+    }
+    if ( r !== vAPI.messaging.UNHANDLED ) {
+        return;
+    }
+
+    // Default handler
+    r = vAPI.messaging.defaultHandler(request.data.msg, sender, callback);
+    if ( r !== vAPI.messaging.UNHANDLED ) {
+        return;
+    }
+
+    console.error('µBlock> messaging > unknown request: %o', request.data);
+
+    // Unhandled:
+    // Need to callback anyways in case caller expected an answer, or
+    // else there is a memory leak on caller's side
+    callback();
+};
+
+/******************************************************************************/
+
+vAPI.messaging.setup = function(defaultHandler) {
+    // Already setup?
+    if ( this.defaultHandler !== null ) {
+        return;
+    }
+
+    if ( typeof defaultHandler !== 'function' ) {
+        defaultHandler = function(){ return vAPI.messaging.UNHANDLED; };
+    }
+    this.defaultHandler = defaultHandler;
+
+    this.gmm.addMessageListener(vAPI.app.name + ':background', this.onMessage);
+};
+
+/******************************************************************************/
+
+vAPI.messaging.broadcast = function(msg) {
+    this.gmm.broadcastAsyncMessage(vAPI.app.name + ':broadcast', msg);
+};
+
+/******************************************************************************/
+
+vAPI.lastError = function() {
+    return null;
+};
+
+/******************************************************************************/
+
+// clean up when the extension is disabled
+
+window.addEventListener('unload', function() {
+    vAPI.messaging.gmm.removeMessageListener(
+        app.name + ':background',
+        vAPI.messaging.postMessage
+    );
+    vAPI.messaging.gmm.removeDelayedFrameScript(vAPI.messaging.frameScript);
+
+    // close extension tabs
+    var enumerator = Services.wm.getEnumerator('navigator:browser');
+    var host = 'ublock';
+    var gBrowser, tabs, i, extURI;
+
+    while (enumerator.hasMoreElements()) {
+        gBrowser = enumerator.getNext().gBrowser;
+        tabs = gBrowser.tabs;
+        i = tabs.length;
+
+        while (i--) {
+            extURI = tabs[i].linkedBrowser.currentURI;
+
+            if (extURI.scheme === 'chrome' && extURI.host === host) {
+                gBrowser.removeTab(tabs[i]);
+            }
+        }
+    }
+});
+
+/******************************************************************************/
+
+})();
+
+/******************************************************************************/