Migrate to MV3 (#144)

Fixes #128 for Gecko

src/manifest.json

@@ -1,22 +1,22 @@
 {
-  "background": {
-    "page": "html/background.html",
-    "persistent": false
-  },
-  "browser_action": {
+  "action": {
     "browser_style": true,
     "default_icon": "img/icon.svg#current",
     "default_popup": "html/popup.html",
     "default_title": "__MSG_extensionName__"
   },
+  "background": {
+    "scripts": ["mjs/background.js"],
+    "type": "module"
+  },
   "browser_specific_settings": {
     "gecko": {
       "id": "[email protected]",
-      "strict_min_version": "102.0"
+      "strict_min_version": "112.0"
     }
   },
   "commands": {
-    "_execute_browser_action": {
+    "_execute_action": {
       "suggested_key": {
         "default": "Alt+Shift+C"
       }
@@ -75,7 +75,7 @@
     "32": "img/icon.svg#current",
     "64": "img/icon.svg"
   },
-  "manifest_version": 2,
+  "manifest_version": 3,
   "name": "__MSG_extensionName__",
   "optional_permissions": [
     "notifications"

src/mjs/icon.js

@@ -6,8 +6,7 @@
 import { ICON } from './constant.js';
 
 /* api */
-const { runtime } = browser;
-const action = browser.action ?? browser.browserAction;
+const { action, runtime } = browser;
 
 /* variables */
 export const icon = new Map();

src/mjs/menu.js

@@ -22,7 +22,7 @@ const { WINDOW_ID_CURRENT } = windows;
 export const menuItems = {
   [OPTIONS_OPEN]: {
     id: OPTIONS_OPEN,
-    contexts: ['browser_action'],
+    contexts: ['action'],
     key: '(&T)'
   },
   [COPY_PAGE]: {
@@ -84,7 +84,7 @@ export const createMenuItem = async (id, title, data = {}) => {
     if (parentId) {
       opt.parentId = parentId;
     }
-    if (contexts.includes('browser_action') || contexts.includes('tab')) {
+    if (contexts.includes('action') || contexts.includes('tab')) {
       if (runtime.id === WEBEXT_ID) {
         menus.create(opt);
       }