Examine source code of Tureng Translate

{
  "manifest_version": 2,
  "name": "Tureng Translate",
  "short_name": "tt",
  "version": "2.2.0",
  "description": "Translate words and phrases by using Tureng",
  "icons": {
    "48": "icons/tt-48.png",
    "96": "icons/tt-96.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "storage",
    "menus"
  ],
  "options_ui": {
    "page": "src/options/options.html"
  },
  "browser_action": {
    "default_icon": "icons/tt-32.png",
    "default_title": "Tureng Translate",
    "default_popup": "src/popup/popup.html"
  },
  "background": {
    "scripts": [
      "src/browser-polyfill.min.js",
      "src/utils.js",
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/browser-polyfill.min.js",
        "src/utils.js",
        "src/content/content.js"
      ],
      "css": [
        "src/content/content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/tt-32.png"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space"
      }
    },
    "translate_in_popup": {
      "suggested_key": {
        "default": "Ctrl+Space"
      },
      "description": "Translate selected text in popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "berkayydinc@gmail.com"
    }
  }
}