diff --git a/platform/firefox/vapi-client.js b/platform/firefox/vapi-client.js
new file mode 100644
index 0000000..871996d
--- /dev/null
+++ b/platform/firefox/vapi-client.js
@@ -0,0 +1,148 @@
+/*******************************************************************************
+
+    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
+*/
+
+// For non background pages
+
+/******************************************************************************/
+
+(function() {
+
+'use strict';
+
+/******************************************************************************/
+
+self.vAPI = self.vAPI || {};
+vAPI.firefox = true;
+
+/******************************************************************************/
+
+var messagingConnector = function(response) {
+    if ( !response ) {
+        return;
+    }
+
+    var channels = vAPI.messaging.channels;
+    var channel, listener;
+
+    if ( response.broadcast === true ) {
+        for ( channel in channels ) {
+            if ( channels.hasOwnProperty(channel) === false ) {
+                continue;
+            }
+            listener = channels[channel].listener;
+            if ( typeof listener === 'function' ) {
+                listener(response.msg);
+            }
+        }
+        return;
+    }
+
+    if ( response.requestId ) {
+        listener = vAPI.messaging.listeners[response.requestId];
+        delete vAPI.messaging.listeners[response.requestId];
+        delete response.requestId;
+    }
+
+    if ( !listener ) {
+        channel = channels[response.portName];
+        listener = channel && channel.listener;
+    }
+
+    if ( typeof listener === 'function' ) {
+        listener(response.msg);
+    }
+};
+
+/******************************************************************************/
+
+var uniqueId = function() {
+    return parseInt(Math.random() * 1e10, 10).toString(36);
+};
+
+/******************************************************************************/
+
+vAPI.messaging = {
+    channels: {},
+    listeners: {},
+    requestId: 1,
+    connectorId: uniqueId(),
+
+    setup: function() {
+        this.connector = function(msg) {
+            messagingConnector(JSON.parse(msg));
+        };
+        addMessageListener(this.connectorId, this.connector);
+    },
+
+    close: function() {
+        if (this.connector) {
+            removeMessageListener(this.connectorId, this.connector);
+            this.connector = null;
+            this.channels = {};
+            this.listeners = {};
+        }
+    },
+
+    channel: function(channelName, callback) {
+        if ( !channelName ) {
+            return;
+        }
+
+        this.channels[channelName] = {
+            portName: channelName,
+            listener: typeof callback === 'function' ? callback : null,
+            send: function(message, callback) {
+                if ( !vAPI.messaging.connector ) {
+                    vAPI.messaging.setup();
+                }
+
+                message = {
+                    portName: vAPI.messaging.connectorId + '|' + this.portName,
+                    msg: message
+                };
+
+                if ( callback ) {
+                    message.requestId = vAPI.messaging.requestId++;
+                    vAPI.messaging.listeners[message.requestId] = callback;
+                }
+
+                sendAsyncMessage('µBlock:background', message);
+            },
+            close: function() {
+                delete vAPI.messaging.channels[this.portName];
+            }
+        };
+
+        return this.channels[channelName];
+    }
+};
+
+/******************************************************************************/
+
+vAPI.canExecuteContentScript = function() {
+    return true;
+};
+
+/******************************************************************************/
+
+})();
+
+/******************************************************************************/