Add dynamic module loading for TB 136+ support

Detect Thunderbird version at runtime and load modules using the
appropriate format (ESM for TB 136+ and JSM for older versions), ensuring
compatibility across releases.

Author: moisseev

experiments/displayReceivedHeader.js

@@ -3,11 +3,28 @@
 
 "use strict";
 
-const {ExtensionCommon} = ChromeUtils.import("resource://gre/modules/ExtensionCommon.jsm");
 const Services = globalThis.Services || ChromeUtils.import("resource://gre/modules/Services.jsm").Services;
 const [majorVersion] = Services.appinfo.platformVersion.split(".", 1);
 
-// eslint-disable-next-line no-var
+/**
+ * Dynamically imports a module based on the Thunderbird version.
+ *
+ * For Thunderbird 136 and above, it imports the ESM version of the module.
+ * For older versions, it imports the JSM version.
+ *
+ * @param {string} name - The name of the module to import.
+ * @returns {*} The exported module object.
+ */
+function importModule(name) {
+    const moduleSubdir = name === "ExtensionSupport" ? "" : "gre";
+    return majorVersion >= 136
+        ? ChromeUtils.importESModule("resource://" + moduleSubdir + "/modules/" + name + ".sys.mjs")[name]
+        : ChromeUtils.import("resource://" + moduleSubdir + "/modules/" + name + ".jsm")[name];
+}
+
+const ExtensionCommon = importModule("ExtensionCommon");
+
+// eslint-disable-next-line no-var, vars-on-top
 var displayReceivedHeader = class extends ExtensionCommon.ExtensionAPI {
     getAPI(context) {
         function getDocumentByTabIndex(windowId, tabIndex) {

manifest.json

@@ -4,12 +4,12 @@
     "gecko": {
       "id": "received@alexander.moisseev",
       "strict_min_version": "78.0",
-      "strict_max_version": "129.*"
+      "strict_max_version": "136.*"
     }
   },
   "name": "Received",
   "description": "Displays the \"Received\" header parsed with a regular expression.",
-  "version": "2.6.0",
+  "version": "2.6.1",
   "author": "Alexander Moisseev (moiseev@mezonplus.ru)",
   "homepage_url": "https://github.com/moisseev/received",
   "icons": {