diff --git a/lib/main.js b/lib/main.js
index 13abc32..43b95aa 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -15,6 +15,8 @@
 	const preferences = require("sdk/simple-prefs");
 	const prefs = preferences.prefs;
 	
+	require("./webExtension");
+	
 	const notificationPref =  {
 		doShow: function(){
 			return prefs.showNotifications;
diff --git a/lib/webExtension.js b/lib/webExtension.js
new file mode 100644
index 0000000..2af9875
--- /dev/null
+++ b/lib/webExtension.js
@@ -0,0 +1,27 @@
+/* jslint moz: true */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+(function(){
+	const webExtension = require("sdk/webextension");
+	const preferences = require("sdk/simple-prefs");
+	const prefs = preferences.prefs;
+	// console.log("starting webExtension");
+	webExtension.startup().then(function(api){
+		api.browser.runtime.onConnect.addListener(function(port){
+			var prefNames = Object.keys(prefs);
+			// console.log("syncing prefs", prefNames);
+			prefNames.forEach(function(name){
+				if (!name.startsWith("sdk.")){
+					var obj = {};
+					obj[name] = prefs[name];
+					port.postMessage(obj);
+					preferences.on(name, function(){
+						obj[name] = prefs[name];
+						port.postMessage(obj);
+					});
+				}
+			});
+		});
+	});
+}());
\ No newline at end of file
diff --git a/package.json b/package.json
index 57ea37b..52073c3 100644
--- a/package.json
+++ b/package.json
@@ -172,11 +172,12 @@
 	"version": "0.3.8-Development",
 	
 	"engines": {
-		"firefox": ">=45.0a1",
-		"fennec": ">=45.0"
+		"firefox": ">=50.0",
+		"fennec": ">=50.0"
 	},
 	"permissions": {
 		"private-browsing": true,
 		"multiprocess": true
-	}
+	},
+	"hasEmbeddedWebExtension": true
 }
diff --git a/releaseNotes.txt b/releaseNotes.txt
index 5c97914..9943708 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -3,7 +3,7 @@ Version 0.3.8:
 		- 
 	
 	new features:
-		- 
+		- added embedded WebExtension to store the preferences for the transition
 	
 	fixes:
 		- prevented error when canvas has size zero
diff --git a/webextension/background.js b/webextension/background.js
new file mode 100644
index 0000000..cc1380c
--- /dev/null
+++ b/webextension/background.js
@@ -0,0 +1,18 @@
+/* jslint moz: true */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+(function(){
+	"use strict";
+	
+	browser.storage.local.set({
+		storageVersion: 0.1
+	});
+	
+	var port = browser.runtime.connect();
+	port.onMessage.addListener(function(data){
+		if (data){
+			browser.storage.local.set(data);
+		}
+	});
+}());
\ No newline at end of file
diff --git a/webextension/manifest.json b/webextension/manifest.json
new file mode 100644
index 0000000..d4673f6
--- /dev/null
+++ b/webextension/manifest.json
@@ -0,0 +1,11 @@
+{
+	"manifest_version": 2,
+	"name": "embeddedCanvasBlocker@kkapsner.de",
+	"version": "0.1",
+	"background": {
+		"scripts": ["background.js"]
+	},
+	"permissions": [
+		"storage"
+	]
+}
\ No newline at end of file