Examine source code of YouTube Dark Mode Pro

{
  "name": "__MSG_name__",
  "short_name": "__MSG_short_name__",
  "manifest_version": 2,
  "version": "2.0.8.8",
  "description": "__MSG_description__",
  "default_locale": "en",
  "browser_action": {
    "default_icon": "48.png",
    "default_title": "__MSG_default_title__"
  },
  "background": {
    "page": "bgr.html",
    "persistent": false
  },
  "options_page": "option.html",
  "options_ui": {
    "chrome_style": true,
    "page": "option.html"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "global.css"
      ]
    }
  ],
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "web_accessible_resources": [
    "*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{70a154ce-19dc-4de1-a842-10a9bd649fa8}"
    }
  }
}