Index: gc_core/js/helpers.js
==================================================================
--- gc_core/js/helpers.js
+++ gc_core/js/helpers.js
@@ -5,24 +5,24 @@
 
 // In Firefox, there is no console.log in PromiseWorker, but there is worker.log.
 // In Thunderbird, you can’t access to console directly. So it’s required to pass a log function.
 let funcOutput = null;
 
-export function setLogOutput (func) {
+function setLogOutput (func) {
     funcOutput = func;
 }
 
-export function echo (obj) {
+function echo (obj) {
     if (funcOutput !== null) {
         funcOutput(obj);
     } else {
         console.log(obj);
     }
     return true;
 }
 
-export function logerror (e, bStack=false) {
+function logerror (e, bStack=false) {
     let sMsg = "\n" + e.fileName + "\n" + e.name + "\nline: " + e.lineNumber + "\n" + e.message;
     if (bStack) {
         sMsg += "\n--- Stack ---\n" + e.stack;
     }
     if (funcOutput !== null) {
@@ -34,11 +34,11 @@
 
 
 // load ressources in workers (suggested by Mozilla extensions reviewers)
 // for more options have a look here: https://gist.github.com/Noitidart/ec1e6b9a593ec7e3efed
 // if not in workers, use sdk/data.load() instead
-export function loadFile (spf) {
+function loadFile (spf) {
     try {
         let xRequest;
         if (typeof XMLHttpRequest !== "undefined") {
             xRequest = new XMLHttpRequest();
         }
@@ -58,21 +58,32 @@
     }
 }
 
 
 // conversions
-export function objectToMap (obj) {
+function objectToMap (obj) {
     let m = new Map();
     for (let param in obj) {
         //console.log(param + " " + obj[param]);
         m.set(param, obj[param]);
     }
     return m;
 }
 
-export function mapToObject (m) {
+function mapToObject (m) {
     let obj = {};
     for (let [k, v] of m) {
         obj[k] = v;
     }
     return obj;
 }
+
+if (typeof(exports) !== 'undefined') {
+    // Used for Grammalecte library.
+    // In content scripts, these variable are directly reachable
+    exports.setLogOutput = setLogOutput;
+    exports.echo = echo;
+    exports.logerror = logerror;
+    exports.loadFile = loadFile;
+    exports.objectToMap = objectToMap;
+    exports.mapToObject = mapToObject;
+}

Index: gc_lang/fr/config.ini
==================================================================
--- gc_lang/fr/config.ini
+++ gc_lang/fr/config.ini
@@ -29,11 +29,14 @@
 
 # Firefox
 fx_identifier = French-GC@grammalecte.net
 fx_name = Grammalecte [fr]
 
+fx_standard_path = C:\Program Files\Mozilla Firefox\firefox.exe
+fx_beta_path = C:\Program Files\Mozilla Firefox Beta\firefox.exe
 fx_nightly_path = C:\Program Files (x86)\Nightly\firefox.exe
+
 
 # Thunderbird
 tb_identifier = French-GC-TB@grammalecte.net
 tb_name = Grammalecte [fr]
 tb_debug_extension_path = _build/tb-debug.profile/extensions/French-GC-TB@grammalecte.net

Index: gc_lang/fr/webext/gce_worker.js
==================================================================
--- gc_lang/fr/webext/gce_worker.js
+++ gc_lang/fr/webext/gce_worker.js
@@ -1,16 +1,25 @@
-/*
-import { echo } from "mymodule";
+
 
+/*
 try {
-    echo("It works! At last!");
+    console.log("BEFORE");
+    //var myhelpers = require('./grammalecte/helpers.js');
+    require(['./grammalecte/helpers.js'], function (foo) {
+        console.log("LOADING");
+        echo("MODULE LOADED2");
+    });
+    console.log("AFTER");
 }
 catch (e) {
+    console.log("\n" + e.fileName + "\n" + e.name + "\nline: " + e.lineNumber + "\n" + e.message);
     console.error(e);
-}
-*/
-"use strict";
+}*/
+
+echo("VA TE FAIRE FOUTRE");
+
+
 
 let gce = null; // module: grammar checker engine
 let text = null;
 let tkz = null; // module: tokenizer
 let lxg = null; // module: lexicographer
@@ -125,11 +134,6 @@
   sendResponse({response: "response from background script"});
 }
 
 browser.runtime.onMessage.addListener(handleMessage);
 
-try {
-    loadGrammarChecker();
-}
-catch (e) {
-    console.error(e);
-}
+

Index: gc_lang/fr/webext/manifest.json
==================================================================
--- gc_lang/fr/webext/manifest.json
+++ gc_lang/fr/webext/manifest.json
@@ -28,11 +28,11 @@
     "default_popup": "panel/main.html",
     "default_title": "Grammalecte [fr]",
     "browser_style": false
   },
   "background": {
-    "scripts": ["gce_worker.js"]
+    "scripts": ["require.js", "grammalecte/helpers.js", "gce_worker.js"]
   },
   "web_accessible_resources": [
     "beasts/frog.jpg",
     "beasts/turtle.jpg",
     "beasts/snake.jpg"

Index: make.py
==================================================================
--- make.py
+++ make.py
@@ -352,11 +352,11 @@
                 with helpers.cd("_build/xpi/"+sLang):
                     os.system("jpm run -b nightly")
 
             if xArgs.web_ext:
                 with helpers.cd("_build/webext/"+sLang):
-                    os.system(r'web-ext run --firefox="' + dVars['fx_nightly_path'] + '" --browser-console')            
+                    os.system(r'web-ext run --firefox="' + dVars['fx_beta_path'] + '" --browser-console')            
 
             # Thunderbird
             if xArgs.thunderbird:
                 os.system("thunderbird -jsconsole -P debug")
         else: