Examine source code of GNotify

{
  "manifest_version": 2,
  "name": "GNotify",
  "version": "1.0.5",
  "description": "原神のログインボーナスを受け取ったかどうかを、ポップアップウィンドウを表示してリマインドします。",
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "notifications",
    "alarms",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon64.png"
  },
  "icons": {
    "32": "icon32.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png"
  }
}