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diff --git a/js/vapi-core.js b/js/vapi-core.js
new file mode 100644
index 0000000..bc7bcb9
--- /dev/null
+++ b/js/vapi-core.js
@@ -0,0 +1,109 @@
+/*******************************************************************************
+
+    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
+*/
+
+/* global self, Components */
+
+// For background page (important functions)
+
+'use strict';
+
+/******************************************************************************/
+
+(function () {
+    const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+    const {Services} = Cu.import('resource://gre/modules/Services.jsm', null);
+
+    let vAPI = self.vAPI = self.vAPI || {};
+    
+    // List of things that needs to be destroyed when disabling the extension
+    // Only functions should be added to it
+    // eMatrix: taken care by vAPI.addCleanUpTask --- use that function
+    let cleanupTasks = [];
+
+    // This must be updated manually, every time a new task is added/removed
+    // eMatrix: do we?
+    let expectedNumberOfCleanups = 7;
+
+    vAPI.addCleanUpTask = function (task) {
+	if (typeof task !== 'function') {
+	    return;
+	}
+
+	cleanupTasks.push(task);
+    };
+
+    vAPI.deferUntil = function (testFn, mainFn, details) {
+	let dtls = (typeof details !== 'object') ? {} : details;
+	let now = 0;
+	let next = dtls.next || 200;
+	let until = dtls.until || 2000;
+
+	let check = function () {
+            if (testFn() === true || now >= until) {
+		mainFn();
+		return;
+            }
+            now += next;
+            vAPI.setTimeout(check, next);
+	};
+
+	if ('sync' in dtls && dtls.sync === true) {
+            check();
+	} else {
+            vAPI.setTimeout(check, 1);
+	}
+    };
+
+    window.addEventListener('unload', function () {
+	// if (typeof vAPI.app.onShutdown === 'function') {
+        //     vAPI.app.onShutdown();
+	// }
+
+	// IMPORTANT: cleanup tasks must be executed using LIFO order.
+	for (let i=cleanupTasks.length-1; i>=0; --i) {
+	    try {
+		cleanupTasks[i]();
+	    } catch (e) {
+		// Just in case a clean up task ends up throwing for
+		// no reason
+		console.error(e);
+	    }
+	}
+
+	// eMatrix: temporarily disabled
+	// if (cleanupTasks.length < expectedNumberOfCleanups) {
+        //     console.error
+	//     ('eMatrix> Cleanup tasks performed: %s (out of %s)',
+        //      cleanupTasks.length,
+        //      expectedNumberOfCleanups);
+	// }
+
+	// frameModule needs to be cleared too
+	let frameModuleURL = vAPI.getURL('frameModule.js');
+	let frameModule = {};
+	
+	Cu.import(frameModuleURL, frameModule);
+	frameModule.contentObserver.unregister();
+	Cu.unload(frameModuleURL);
+    });
+})();