Index: gc_lang/fr/mailext/background.js
==================================================================
--- gc_lang/fr/mailext/background.js
+++ gc_lang/fr/mailext/background.js
@@ -356,10 +356,11 @@
                 console.log("[background] Unknown command: " + sCommand);
                 console.log(oRequest);
         }
     });
     //xPort.postMessage({sActionDone: "newId", result: iPortId});
+    //console.log("[Grammalecte] init connection to content-script");
     xPort.postMessage({sActionDone: "init", sUrl: browser.extension.getURL("")});
 }
 
 browser.runtime.onConnect.addListener(handleConnexion);
 
@@ -368,16 +369,12 @@
 /*
     ComposeAction
     (Thunderbird only)
 */
 if (bThunderbird) {
-    console.log("[Grammalecte] Thunderbird: listening compose action...");
     browser.composeAction.onClicked.addListener(function (xTab, xData) {
-        console.log("ComposeAction clicked");
-        console.log(xTab);
-        console.log(xData);
-        browser.tabs.sendMessage(xTab.id, {sActionRequest: "grammar_checker_compose_window"});
+        sendCommandToTab(xTab.id, "grammar_checker_compose_window");
     });
 }
 
 
 /*

ADDED   gc_lang/fr/webext/content_scripts/editor.js
Index: gc_lang/fr/webext/content_scripts/editor.js
==================================================================
--- gc_lang/fr/webext/content_scripts/editor.js
+++ gc_lang/fr/webext/content_scripts/editor.js
@@ -0,0 +1,96 @@
+// JavaScript
+
+// Editor for HTML page
+
+
+"use strict";
+
+
+class HTMLPageEditor {
+
+	constructor (xRootNode=document.rootElement, bCheckSignature=false) {
+        this.xRootNode = xRootNode;
+        this.lNode = [];
+        this.bCheckSignature = bCheckSignature;
+        this._lParsableNodes = ["P", "LI"];
+        this._lRootNodes = ["DIV", "UL", "OL"];
+
+    }
+
+    * _getParsableNodes (xRootNode) {
+        // recursive function
+        try {
+            for (let xNode of this.xRootNode.childNodes) {
+                if (xNode.className !== "moz-cite-prefix" && xNode.tagName !== "BLOCKQUOTE"
+                    && (xNode.nodeType == Node.TEXT_NODE || (xNode.nodeType == Node.ELEMENT_NODE && !xNode.textContent.startsWith(">")))
+                    && xNode.textContent !== "") {
+                    if (xNode.tagName === undefined) {
+                        if (!this.bCheckSignature && xNode.textContent.startsWith("-- ")) {
+                            break;
+                        }
+                        yield xNode;
+                    }
+                    else if (this._lParsableNodes.includes(xNode.tagName)) {
+                        yield xNode;
+                    }
+                    else if (this._lRootNodes.includes(xNode.tagName)) {
+                        yield* this._getParsableNodes(xNode);
+                    }
+                }
+            }
+        }
+        catch (e) {
+            showError(e);
+        }
+    }
+
+    * getParagraphs () {
+        try {
+            let i = 0;
+            for (let xNode of this._getParsableNodes()) {
+                this.lNode.push(xNode);
+                yield [i, xNode.textContent];
+                i += 1;
+            }
+        }
+        catch (e) {
+            showError(e);
+        }
+    }
+
+    getPageText () {
+        try {
+            let sPageText = "";
+            for (let [i, sLine] of this.getParagraphs()) {
+                sPageText += sLine + "\n";
+            }
+            return sPageText;
+        }
+        catch (e) {
+            showError(e);
+        }
+    }
+
+    getParagraph (iPara) {
+        try {
+            return this.lNode[iPara].textContent;
+        }
+        catch (e) {
+            showError(e);
+        }
+    }
+
+    writeParagraph (iPara, sText) {
+        try {
+            return this.lNode[iPara].textContent = sText;
+        }
+        catch (e) {
+            showError(e);
+        }
+    }
+
+    changeParagraph (iPara, sModif, iStart, iEnd) {
+        let sText = this.getParagraph(iPara);
+        this.writeParagraph(iPara, sText.slice(0, iStart) + sModif + sText.slice(iEnd));
+    }
+}

Index: gc_lang/fr/webext/content_scripts/init.js
==================================================================
--- gc_lang/fr/webext/content_scripts/init.js
+++ gc_lang/fr/webext/content_scripts/init.js
@@ -383,10 +383,11 @@
         }.bind(this));
         this.xConnect.onMessage.addListener(function (oMessage) {
             let { sActionDone, result, oInfo, bEnd, bError } = oMessage;
             switch (sActionDone) {
                 case "init":
+                    //console.log("[Grammalecte] content-script: init");
                     this.bConnected = true;
                     oGrammalecte.sExtensionUrl = oMessage.sUrl;
                     oGrammalecte.listen();
                     oGrammalecte.createButton();
                     break;