Examine source code of google_translate_helper

{
  "description": "create a google dictory",
  "manifest_version": 2,
  "name": "google_translate_helper",
  "version": "1.1.1",
  "homepage_url": "https://github.com/geniousli/google_translate_helper",
  "icons": {
    "48": "icons/translate-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://translate.google.cn/*",
        "*://translate.google.com/*"
      ],
      "js": [
        "toast.js",
        "dictionary.js"
      ],
      "css": [
        "dictionary.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>"
  ]
}