Examine source code of Translator Extension

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Translator Extension",
  "short_name": "Translator",
  "version": "1.0",
  "description": "Translator Extension for Chrome. Translates any text by Google Translate with a mouse click",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "https://translate.google.com/"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_title": "Translator"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f51284d8-0c92-4757-9a42-b2fc9573786e}"
    }
  }
}