Examine source code of Longman Dictionary

{
  "manifest_version": 2,
  "version": "1.0.4",
  "name": "LDOCE",
  "description": "Select a word or phrase, right click, and choose LDOCE to look up its definition on Longman Dictionary of Contemporary English seamlessly.",
  "author": "Nhân Trí",
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "64": "icon.png",
    "128": "icon.png",
    "256": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec97e516-7ff1-4625-8058-6546ee31068b}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}