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diff --git a/js/vapi-net.js b/js/vapi-net.js
new file mode 100644
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--- /dev/null
+++ b/js/vapi-net.js
@@ -0,0 +1,69 @@
+/*******************************************************************************
+
+    ηMatrix - a browser extension to black/white list requests.
+    Copyright (C) 2014-2019 The uMatrix/uBlock Origin authors
+    Copyright (C) 2019 Alessio Vanni
+
+    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://gitlab.com/vannilla/ematrix
+    uMatrix Home: https://github.com/gorhill/uMatrix
+*/
+
+'use strict';
+
+/******************************************************************************/
+
+(function () {
+    vAPI.net = {};
+
+    vAPI.net.registerListeners = function () {
+	this.onBeforeRequest.types = this.onBeforeRequest.types
+	    ? new Set(this.onBeforeRequest.types)
+	    : null;
+	
+	this.onBeforeSendHeaders.types = this.onBeforeSendHeaders.types
+	    ? new Set(this.onBeforeSendHeaders.types)
+	    : null;
+
+	let shouldLoadListenerMessageName = location.host + ':shouldLoad';
+	let shouldLoadListener = function (e) {
+            let details = e.data;
+            let pendingReq = vAPI.httpObserver.createPendingRequest(details.url);
+            pendingReq.rawType = details.rawType;
+            pendingReq.tabId = vAPI.tabs.manager.tabIdFromTarget(e.target);
+	};
+
+	// https://github.com/gorhill/uMatrix/issues/200
+	// We need this only for Firefox 34 and less: the tab id is derived from
+	// the origin of the message.
+	if (!vAPI.modernFirefox) {
+            vAPI.messaging.globalMessageManager
+		.addMessageListener(shouldLoadListenerMessageName,
+				    shouldLoadListener);
+	}
+
+	vAPI.httpObserver.register();
+
+	vAPI.addCleanUpTask(function () {
+            if (!vAPI.modernFirefox) {
+		vAPI.messaging.globalMessageManager
+		    .removeMessageListener(shouldLoadListenerMessageName,
+					   shouldLoadListener);
+            }
+
+            vAPI.httpObserver.unregister();
+	});
+    };
+})();