Examine source code of WordBook-Vinyan

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "WordBook",
  "version": "1.0.0",
  "description": "A popup dictionary for quickly looking up word-meanings. It also allows you to save new words that you like and build your vocabulary.",
  "icons": {
    "48": "icons/wordbook.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dictionary-wordbook.js",
        "pages/saved-list.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/wordbook.png"
    },
    "default_title": "WordBook",
    "default_popup": "/pages/saved-list.html"
  },
  "permissions": [
    "menus",
    "storage",
    "unlimitedStorage",
    "https://www.google.com/"
  ],
  "background": {
    "scripts": [
      "background_scripts/menus.js",
      "background_scripts/actions.js",
      "background_scripts/fetch-definition.js"
    ]
  }
}