Examine source code of Longdo Dict Menu

{
  "manifest_version": 2,
  "name": "Longdo Dict Menu",
  "version": "3.0.3",
  "default_locale": "th",
  "browser_specific_settings": {
    "gecko": {
      "id": "jid0-bLBXGTyPACqmESWjZIWHfcCUaas@jetpack",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "menus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "images/longdo-icon.svg",
    "96": "images/longdo-icon.svg"
  },
  "developer": {
    "name": "Chengings",
    "url": "https://github.com/Chengings/Longdo-Dict-Menu"
  }
}