diff --git a/platform/firefox/processScript.js b/platform/firefox/processScript.js
new file mode 100644
index 000000000..b5625736c
--- /dev/null
+++ b/platform/firefox/processScript.js
@@ -0,0 +1,40 @@
+/*******************************************************************************
+
+    uBlock Origin - a browser extension to block requests.
+    Copyright (C) 2016 The uBlock Origin 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
+*/
+
+/******************************************************************************/
+
+// https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIProcessScriptLoader
+
+// Some module tasks need to run once per-content process. This is the purpose
+// of this content process script.
+
+(function() {
+    'use strict';
+
+    let {processObserver} = Components.utils.import(
+        Components.stack.filename.replace('processScript.js', 'frameModule.js'),
+        null
+    );
+
+    processObserver.start();
+})();
+
+/******************************************************************************/