Index: gc_lang/fr/webext/background.js
==================================================================
--- gc_lang/fr/webext/background.js
+++ gc_lang/fr/webext/background.js
@@ -72,5 +72,37 @@
     }
     //sendResponse({response: "response from background script"});
 }
 
 browser.runtime.onMessage.addListener(handleMessage);
+
+
+/*
+    Context Menu
+*/
+browser.contextMenus.create({
+    id: "grammar_checking",
+    title: "Correction grammaticale",
+    contexts: ["selection", "editable", "page"]
+});
+
+browser.contextMenus.create({
+    id: "lexicographer",
+    title: "Lexicographe",
+    contexts: ["selection", "editable", "page"]
+});
+
+browser.contextMenus.onClicked.addListener(function (xInfo, xTab) {
+    // xInfo = https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/contextMenus/OnClickData
+    // xTab = https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/Tab
+    console.log(xInfo);
+    console.log(xTab);
+    console.log("Item " + xInfo.menuItemId + " clicked in tab " + xTab.id);
+    console.log("editable: " + xInfo.editable + " · selected: " + xInfo.selectionText);
+    // confusing: no way to get the node where we click?!
+    switch (xInfo.menuItemId) {
+        case "grammar_checking":
+            break;
+        case "lexicographer":
+            break;
+    }
+});

Index: gc_lang/fr/webext/manifest.json
==================================================================
--- gc_lang/fr/webext/manifest.json
+++ gc_lang/fr/webext/manifest.json
@@ -39,8 +39,9 @@
     "grammalecte/fr/mfsp_data.json",
     "grammalecte/fr/phonet_data.json",
     "grammalecte/fr/tests_data.json"
   ],
   "permissions": [
-    "activeTab"
+    "activeTab",
+    "contextMenus"
   ]
 }