Index: gc_lang/fr/tb/content/about.js
==================================================================
--- gc_lang/fr/tb/content/about.js
+++ gc_lang/fr/tb/content/about.js
@@ -1,15 +1,10 @@
 // JavaScript
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cu = Components.utils;
-//const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
-
-function echo (...args) {
-    Services.console.logStringMessage(args.join(" -- ") + "\n");
-}
 
 
 function openInBrowserURL (sURL) {
     // method found in S3.Google.Translator
     try {

Index: gc_lang/fr/tb/content/conjugueur.js
==================================================================
--- gc_lang/fr/tb/content/conjugueur.js
+++ gc_lang/fr/tb/content/conjugueur.js
@@ -1,44 +1,39 @@
 // JavaScript
 
 const Cu = Components.utils;
-const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
-const conj = require("resource://grammalecte/fr/conj.js");
-
-
-function echo (...args) {
-    Services.console.logStringMessage(args.join(" -- ") + "\n");
-}
+//const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
+//const conj = require("resource://grammalecte/fr/conj.js");
 
 
 let oConj = {
     init: function () {
-        let that = this;
+        console.log("Init conjugueur");
         try {
             // button
-            document.getElementById('conjugate').addEventListener("click", function (event) {
-                that.getVerbAndConjugate();
+            document.getElementById('conjugate').addEventListener("click", (xEvent) => {
+                this.getVerbAndConjugate();
             });
             // text field
-            document.getElementById('verb').addEventListener("change", function (event) {
-                that.getVerbAndConjugate();
+            document.getElementById('verb').addEventListener("change", (xEvent) => {
+                this.getVerbAndConjugate();
             });
             // options
-            document.getElementById('oneg').addEventListener("click", function (event) {
-                that._displayResults();
-            });
-            document.getElementById('opro').addEventListener("click", function (event) {
-                that._displayResults();
-            });
-            document.getElementById('oint').addEventListener("click", function (event) {
-                that._displayResults();
-            });
-            document.getElementById('ofem').addEventListener("click", function (event) {
-                that._displayResults();
-            });
-            document.getElementById('otco').addEventListener("click", function (event) {
-                that._displayResults();
+            document.getElementById('oneg').addEventListener("click", (xEvent) => {
+                this._displayResults();
+            });
+            document.getElementById('opro').addEventListener("click", (xEvent) => {
+                this._displayResults();
+            });
+            document.getElementById('oint').addEventListener("click", (xEvent) => {
+                this._displayResults();
+            });
+            document.getElementById('ofem').addEventListener("click", (xEvent) => {
+                this._displayResults();
+            });
+            document.getElementById('otco').addEventListener("click", (xEvent) => {
+                this._displayResults();
             });
         }
         catch (e) {
             Cu.reportError(e);
         }

Index: gc_lang/fr/tb/content/conjugueur.xul
==================================================================
--- gc_lang/fr/tb/content/conjugueur.xul
+++ gc_lang/fr/tb/content/conjugueur.xul
@@ -152,7 +152,8 @@
         <label id="condb6" class="cj">.</label>
       </groupbox>
     </column>
   </columns>
 
+  <script type="application/javascript" src="resource://grammalecte/fr/conj.js"/>
   <script type="application/javascript" src="conjugueur.js"/>
 </dialog>

Index: gc_lang/fr/tb/content/editor.js
==================================================================
--- gc_lang/fr/tb/content/editor.js
+++ gc_lang/fr/tb/content/editor.js
@@ -19,15 +19,13 @@
 
     * _getParsableNodes (xRootNode=this.xEditor.rootElement) {
         // recursive function
         try {
             for (let xNode of xRootNode.childNodes) {
-                //echo("tag: " + xNode.tagName);
                 if (xNode.className !== "moz-cite-prefix" && xNode.tagName !== "BLOCKQUOTE"
                     && (xNode.nodeType == Node.TEXT_NODE || (xNode.nodeType == Node.ELEMENT_NODE && !xNode.textContent.startsWith(">")))
                     && xNode.textContent !== "") {
-                    //echo("<"+xNode.tagName+">["+xNode.textContent+"]");
                     if (xNode.tagName === undefined) {
                         if (!prefs.getBoolPref("bCheckSignature") && xNode.textContent.startsWith("-- ")) {
                             break;
                         }
                         yield xNode;

Index: gc_lang/fr/tb/content/gc_options.js
==================================================================
--- gc_lang/fr/tb/content/gc_options.js
+++ gc_lang/fr/tb/content/gc_options.js
@@ -2,28 +2,22 @@
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cu = Components.utils;
 const prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("extensions.grammarchecker.");
-//const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
 
-function echo (...args) {
-    Services.console.logStringMessage(args.join(" -- ") + "\n");
-}
 
 var oOptControl = {
     oOptions: null,
     load: function () {
         this._setDialogOptions(false);
     },
     _setDialogOptions: function (bDefaultOptions=false) {
         try {
             sOptions = bDefaultOptions ? prefs.getCharPref("sGCDefaultOptions") : prefs.getCharPref("sGCOptions");
-            //echo(">> " + sOptions);
             this.oOptions = JSON.parse(sOptions);
             for (let sParam in this.oOptions) {
-                //echo(sParam + ":" + oOptions[sParam]);
                 if (document.getElementById("option_"+sParam) !== null) {
                     document.getElementById("option_"+sParam).checked = this.oOptions[sParam];
                 }
             }
         }
@@ -35,11 +29,10 @@
         try {
             for (let xNode of document.getElementsByClassName("option")) {
                 this.oOptions[xNode.id.slice(7)] = xNode.checked;
             }
             prefs.setCharPref("sGCOptions", JSON.stringify(this.oOptions));
-            //echo("<< " + JSON.stringify(this.oOptions));
         }
         catch (e) {
             Cu.reportError(e);
         }
     },

Index: gc_lang/fr/tb/content/overlay.js
==================================================================
--- gc_lang/fr/tb/content/overlay.js
+++ gc_lang/fr/tb/content/overlay.js
@@ -4,27 +4,18 @@
 
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cu = Components.utils;
-const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
+//const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
 
 const { BasePromiseWorker } = Cu.import('resource://gre/modules/PromiseWorker.jsm', {});
 const Task = Cu.import("resource://gre/modules/Task.jsm").Task;
 const prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("extensions.grammarchecker.");
-//Cu.import("resource://gre/modules/Console.jsm"); // doesn’t work
-//const xConsole = Cc["@mozilla.org/consoleservice;1"].getService(Ci.nsIConsoleService);
-//xConsole.logStringMessage("Grammalecte: " + args.join(" · ")); // useless now. Use: Services.console.logStringMessage("***");
-
-const text = require("resource://grammalecte/text.js");
-const tf = require("resource://grammalecte/fr/textformatter.js");
-
-
-function echo (...args) {
-    dump(args.join(" -- ") + "\n");  // obsolete since TB 52?
-    Services.console.logStringMessage("Grammalecte: " + args.join(" · "));
-}
+
+//const text = require("resource://grammalecte/text.js");
+//const tf = require("resource://grammalecte/fr/textformatter.js");
 
 
 const oConverterToExponent = {
     dNumbers: new Map ([
         ["1", "¹"], ["2", "²"], ["3", "³"], ["4", "⁴"], ["5", "⁵"],
@@ -45,79 +36,79 @@
     xGCEWorker: null,
     bDictActive: null,
     loadGC: function () {
         if (this.xGCEWorker === null) {
             // Grammar checker
-            echo('Loading Grammalecte');
+            console.log('Loading Grammalecte');
             this.xGCEWorker = new BasePromiseWorker('chrome://promiseworker/content/gce_worker.js');
             let xPromise = this.xGCEWorker.post('loadGrammarChecker', [prefs.getCharPref("sGCOptions"), "Thunderbird"]);
             xPromise.then(
                 function (aVal) {
-                    echo(aVal);
+                    console.log(aVal);
                     prefs.setCharPref("sGCOptions", aVal);
                 },
-                function (aReason) { echo('Promise rejected - ', aReason); }
+                function (aReason) { console.log('Promise rejected - ', aReason); }
             ).catch(
-                function (aCaught) { echo('Promise Error - ', aCaught); }
+                function (aCaught) { console.log('Promise Error - ', aCaught); }
             );
         }
     },
     fullTests: function () {
-        echo('Performing tests... Wait...');
+        console.log('Performing tests... Wait...');
         let xPromise = this.xGCEWorker.post('fullTests', ['{"nbsp":true, "esp":true, "unit":true, "num":true}']);
         xPromise.then(
             function (aVal) {
-                echo('Done.');
-                echo(aVal);
+                console.log('Done.');
+                console.log(aVal);
             },
-            function (aReason) { echo('Promise rejected', aReason); }
+            function (aReason) { console.log('Promise rejected', aReason); }
         ).catch(
-            function (aCaught) { echo('Promise Error', aCaught); }
+            function (aCaught) { console.log('Promise Error', aCaught); }
         );
     },
     test: function (sText) {
-        echo("Test...");
+        console.log("Test...");
         let xPromise = this.xGCEWorker.post('parse', [sText, "FR", true]);
         xPromise.then(
             function (aVal) {
                 let lErr = JSON.parse(aVal);
                 if (lErr.length > 0) {
                     for (let dErr of lErr) {
-                        echo(text.getReadableError(dErr));
+                        console.log(text.getReadableError(dErr));
                     }
                 } else {
-                    echo("no error found");
+                    console.log("no error found");
                 }
             },
-            function (aReason) { echo('Promise rejected', aReason); }
+            function (aReason) { console.log('Promise rejected', aReason); }
         ).catch(
-            function (aCaught) { echo('Promise Error', aCaught); }
+            function (aCaught) { console.log('Promise Error', aCaught); }
         );
     },
     setOptions: function () {
-        echo('Set options');
+        console.log('Set options');
         let xPromise = this.xGCEWorker.post('setOptions', [prefs.getCharPref("sGCOptions")]);
         xPromise.then(
             function (aVal) {
-                echo(aVal);
+                console.log(aVal);
                 prefs.setCharPref("sGCOptions", aVal);
             },
-            function (aReason) { echo('Promise rejected', aReason); }
+            function (aReason) { console.log('Promise rejected', aReason); }
         ).catch(
-            function (aCaught) { echo('Promise Error', aCaught); }
+            function (aCaught) { console.log('Promise Error', aCaught); }
         );
     },
     resetOptions: function () {
         let xPromise = this.xGCEWorker.post('resetOptions');
         xPromise.then(
             function (aVal) {
-                echo(aVal);
+                console.log(aVal);
                 prefs.setCharPref("sGCOptions", aVal);
             },
-            function (aReason) { echo('Promise rejected', aReason); }
+            function (aReason) { console.log('Promise rejected', aReason); }
         ).catch(
-            function (aCaught) { echo('Promise Error', aCaught); }
+            function (aCaught) { console.log('Promise Error', aCaught); }
         );
     },
     _getGCResultPromise: function (sParagraph, sLang, bDebug, bContext) {
         // For some reason, you can’t use result of PromiseWorker within a Task,
         // you have to wrap it in a common Promise. Task and yield can be replaced with async / await when it is available.
@@ -186,11 +177,11 @@
             let xResultNode = document.getElementById("resnode"+iParagraph);
             xResultNode.textContent = "…………… réanalyse en cours ……………";
             let sParagraph = xEditor.getParagraph(iParagraph);
             let xPromise = this._getGCResultPromise(sParagraph, "FR", false, false);
             xPromise.then(function (res) {
-                //echo("res: " + res);
+                //console.log("res: " + res);
                 xResultNode.textContent = "";
                 let oRes = JSON.parse(res);
                 if (oRes.aGrammErr.length > 0 || oRes.aSpellErr.length > 0) {
                     that.fillResultNode(xResultNode, xEditor, sParagraph, iParagraph, oRes.aGrammErr, oRes.aSpellErr);
                 }
@@ -369,11 +360,11 @@
         xNodeSuggLine.appendChild(xNodeSuggButton);
         xNodeDiv.appendChild(xNodeSuggLine);
         return xNodeDiv;
     },
     loadUI: function() {
-        echo("loadUI");
+        console.log("loadUI");
         this._strings = document.getElementById("grammarchecker-strings");
         let that = this;
         let nsGrammarCommand = {
             isCommandEnabled: function (aCommand, dummy) {
                 return (IsDocumentEditable() && !IsInHTMLSourceMode());
@@ -472,24 +463,24 @@
     onOpenGCOptions: function (e) {
         let that = this;
         let xPromise = this.xGCEWorker.post('getDefaultOptions');
         xPromise.then(
             function (aVal) {
-                echo(aVal);
+                console.log(aVal);
                 prefs.setCharPref("sGCDefaultOptions", aVal);
             },
-            function (aReason) { echo('Promise rejected', aReason); }
+            function (aReason) { console.log('Promise rejected', aReason); }
         ).catch(
-            function (aCaught) { echo('Promise Error', aCaught); }
+            function (aCaught) { console.log('Promise Error', aCaught); }
         ).then(
             function () {
                 that.openDialog("chrome://grammarchecker/content/gc_options.xul", "", "chrome, dialog, modal, resizable=no");
                 that.setOptions();
             },
-            function (aReason) { echo('Error options dialog', aReason); }
+            function (aReason) { console.log('Error options dialog', aReason); }
         ).catch(
-            function (aCaught) { echo('Error', aCaught); }
+            function (aCaught) { console.log('Error', aCaught); }
         );
     },
     onOpenSpellOptions: function (e) {
         this.openDialog("chrome://grammarchecker/content/spell_options.xul", "", "chrome, dialog, modal, resizable=no");
     },
@@ -566,11 +557,11 @@
     saveOptions: function () {
         let oOptions = {};
         for (let xNode of document.getElementsByClassName("option")) {
             oOptions[xNode.id] = xNode.checked;
         }
-        //echo("save options: " + JSON.stringify(oOptions));
+        //console.log("save options: " + JSON.stringify(oOptions));
         prefs.setCharPref("sTFOptions", JSON.stringify(oOptions));
     },
     setOptionsInPanel: function (oOptions) {
         for (let sOptName in oOptions) {
             //console.log(sOptName + ":" + oOptions[sOptName]);
@@ -880,15 +871,15 @@
         return sText;
     },
     formatText: function (sText, sOptName) {
         let nCount = 0;
         try {
-            if (!tf.oReplTable.hasOwnProperty(sOptName)) {
-                echo("# Error. TF: there is no option “" + sOptName+ "”.");
+            if (!oReplTable.hasOwnProperty(sOptName)) {
+                console.log("# Error. TF: there is no option “" + sOptName+ "”.");
                 return [sText, nCount];
             }
-            for (let [zRgx, sRep] of tf.oReplTable[sOptName]) {
+            for (let [zRgx, sRep] of oReplTable[sOptName]) {
                 nCount += (sText.match(zRgx) || []).length;
                 sText = sText.replace(zRgx, sRep);
             }
         }
         catch (e) {

Index: gc_lang/fr/tb/content/overlay.xul
==================================================================
--- gc_lang/fr/tb/content/overlay.xul
+++ gc_lang/fr/tb/content/overlay.xul
@@ -5,10 +5,12 @@
 
 <overlay id="grammarchecker-overlay"
          xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
 
   <script type="application/javascript" src="chrome://global/content/globalOverlay.js"/>
+  <script type="application/javascript" src="resource://grammalecte/text.js"/>
+  <script type="application/javascript" src="resource://grammalecte/fr/textformatter.js"/>
   <script type="application/javascript" src="overlay.js"/>
   <script type="application/javascript" src="spellchecker.js"/>
   <script type="application/javascript" src="editor.js"/>
 
   <stringbundleset id="stringbundleset">

Index: gc_lang/fr/tb/content/spell_options.js
==================================================================
--- gc_lang/fr/tb/content/spell_options.js
+++ gc_lang/fr/tb/content/spell_options.js
@@ -5,16 +5,10 @@
 
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cu = Components.utils;
 const prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("extensions.grammarchecker.");
-const { require } = Cu.import("resource://gre/modules/commonjs/toolkit/require.js", {});
-
-
-function echo (...args) {
-	Services.console.logStringMessage(args.join(" -- ") + "\n");
-}
 
 
 var oDialogControl = {
 	load: function () {
 		try {

Index: gc_lang/fr/tb/content/spellchecker.js
==================================================================
--- gc_lang/fr/tb/content/spellchecker.js
+++ gc_lang/fr/tb/content/spellchecker.js
@@ -30,11 +30,11 @@
 /*
 const parser = Cc["@mozilla.org/parserutils;1"].getService(Ci.nsIParserUtils);
 const persodict = Cc["@mozilla.org/spellchecker/personaldictionary;1"].getService(Ci.mozIPersonalDictionary);
 */
 
-const system = require("sdk/system");
+//const system = require("sdk/system");
 
 
 var oSpellControl = {
 	xSCEngine: null,
 	init: function () {
@@ -131,16 +131,17 @@
 		try {
 			let that = this;
 			let sPath = "/content/dictionaries/" + sDictName;
 			AddonManager.getAddonByID("French-GC-TB@grammalecte.net", function (addon) {
 				let xURI = addon.getResourceURI(sPath);
-				//console.log("> " + xURI.path);
+				console.log("> " + xURI.path);
 				let sFolder = xURI.path;
-				if (system.platform === "winnt") {
+				//if (system.platform === "winnt") {
+				if (sFolder) {
 					sFolder = sFolder.slice(1).replace(/\//g, "\\\\");
 				}
-				//console.log("> " + sFolder);
+				console.log("> " + sFolder);
 				if (bActivate) {
 					that.addDirectory(sFolder);
 				} else {
 					that.removeDirectory(sFolder);
 				}