Index: gc_core/js/helpers.js
==================================================================
--- gc_core/js/helpers.js
+++ gc_core/js/helpers.js
@@ -72,11 +72,10 @@
 
     // conversions
     objectToMap: function (obj) {
         let m = new Map();
         for (let param in obj) {
-            //console.log(param + " " + obj[param]);
             m.set(param, obj[param]);
         }
         return m;
     },
 

Index: gc_lang/fr/webext/background.js
==================================================================
--- gc_lang/fr/webext/background.js
+++ gc_lang/fr/webext/background.js
@@ -25,11 +25,11 @@
     // https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent
     try {
         let {sActionDone, result, dInfo} = e.data;
         switch (sActionDone) {
             case "init":
-                browser.storage.local.set({"gc_options": result});
+                storeGCOptions(result);
                 break;
             case "parse":
             case "parseAndSpellcheck":
             case "parseAndSpellcheck1":
             case "getListOfTokens":
@@ -51,15 +51,15 @@
             case "getOptions":
             case "getDefaultOptions":
             case "resetOptions":
                 // send result to panel
                 browser.runtime.sendMessage(e.data);
-                browser.storage.local.set({"gc_options": result});
+                storeGCOptions(result);
                 break;
             case "setOptions":
             case "setOption":
-                browser.storage.local.set({"gc_options": result});
+                storeGCOptions(result);
                 break;
             default:
                 console.log("[background] Unknown command: " + sActionDone);
                 console.log(e.data);
         }
@@ -260,10 +260,23 @@
 
 
 /*
     Actions
 */
+
+function storeGCOptions (dOptions) {
+    if (bChrome) {
+        // JS crap again. Chrome can’t store Map object.
+        let obj = {};
+        for (let [k, v] of dOptions) {
+            obj[k] = v;
+        }
+        dOptions = obj;
+    }
+    browser.storage.local.set({"gc_options": dOptions});
+}
+
 function parseAndSpellcheckSelectedText (iTab, sText) {
     // send message to the tab
     let xTabPort = dConnx.get(iTab);
     xTabPort.postMessage({sActionDone: "openGCPanel", result: null, dInfo: null, bEnd: false, bError: false});
     // send command to the worker

Index: gc_lang/fr/webext/panel/main.js
==================================================================
--- gc_lang/fr/webext/panel/main.js
+++ gc_lang/fr/webext/panel/main.js
@@ -149,21 +149,20 @@
         setGCOptions(dSavedOptions.gc_options);
     }
 }
 
 function setGCOptions (dOptions) {
-    console.log(typeof(dOptions));
-    console.log(dOptions);
-    /*for (let [sOpt, bVal] of dOptions) {
+    if (bChrome) {
+        // JS crap again. Chrome can’t store Map object.
+        let m = new Map();
+        for (let param in dOptions) {
+            m.set(param, dOptions[param]);
+        }
+        dOptions = m;
+    }
+    for (let [sOpt, bVal] of dOptions) {
+        console.log(sOpt + ": " + bVal);
         if (document.getElementById("option_"+sOpt)) {
             document.getElementById("option_"+sOpt).checked = bVal;
         }
-    }*/
-    // JS bullshit never ends. For some reason, it’s not a Map anymore on Chrome! 
-    for (let xOption of document.getElementsByClassName("gc_option")) {
-        console.log(xOption.id);
-        let sOpt = xOption.id.slice(7);
-        if (dOptions.has(sOpt)) {
-            xOption.checked = dOptions.get(sOpt);
-        }
     }
 }