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
@@ -118,11 +118,11 @@
         }
     },
 
     createMessageBox: function () {
         if (this.oMessageBox === null) {
-            this.oMessageBox = new GrammalecteMessageBox("grammalecte_message_box", "Grammalecte", 400, 300);
+            this.oMessageBox = new GrammalecteMessageBox("grammalecte_message_box", "Grammalecte", 400, 250);
             this.oMessageBox.insertIntoPage();
         }
     },
 
     startGCPanel: function (xNode=null) {
@@ -146,12 +146,12 @@
         oGrammalecte.oTFPanel.show();
     },
 
     showMessage: function (sMessage) {
         oGrammalecte.createMessageBox();
-        oGrammalecte.oMessageBox.setMessage(sMessage);
         oGrammalecte.oMessageBox.show();
+        oGrammalecte.oMessageBox.addMessage(sMessage);
     },
 
     getPageText: function () {
         let sPageText = document.body.innerText;
         let nPos = sPageText.indexOf("__grammalecte_panel__");

Index: gc_lang/fr/webext/content_scripts/message_box.js
==================================================================
--- gc_lang/fr/webext/content_scripts/message_box.js
+++ gc_lang/fr/webext/content_scripts/message_box.js
@@ -24,10 +24,11 @@
             let xTitle = oGrammalecte.createNode("div", {className: "grammalecte_panel_title"});
             xTitle.appendChild(this._createLogo());
             xTitle.appendChild(oGrammalecte.createNode("div", {className: "grammalecte_message_box_label", textContent: sTitle}));
             this.xMessageBoxBar.appendChild(xTitle);
             xMessageBox.appendChild(this.xMessageBoxBar);
+
             xMessageBox.appendChild(this.xMessageBoxContent);
             return xMessageBox;
         }
         catch (e) {
             showError(e);
@@ -60,15 +61,22 @@
         this.xMessageBox.style.display = "block";
     }
 
     hide () {
         this.xMessageBox.style.display = "none";
+        this.clear();
+    }
+
+    addMessage (sMessage) {
+    	this.xMessageBoxContent.appendChild(oGrammalecte.createNode("div", {className: "grammalecte_message_box_message", textContent: sMessage}));
     }
 
-    setMessage (sMessage) {
-    	this.xMessageBoxContent.textContent = sMessage;
+    clear () {
+        while (this.xMessageBoxContent.firstChild) {
+            this.xMessageBoxContent.removeChild(this.xMessageBoxContent.firstChild);
+        }
     }
 
     center () {
         this.xMessageBox.style = `top: 50%; left: 50%; width: ${this.nWidth}px; height: ${this.nHeight}px; margin-top: -${this.nHeight/2}px; margin-left: -${this.nWidth/2}px;`;
     }
 }