Examine source code of GitHub Dark Theme

{
  "manifest_version": 2,
  "name": "GitHub Dark Theme",
  "short_name": "GitHub Dark Theme",
  "description": "A Dark theme for all of GitHub based on Atom One Dark.",
  "version": "1.1.31",
  "applications": {
    "gecko": {
      "id": "{1dbe3fd3-f191-4a3b-a5d7-a6f95ed2aea1}"
    }
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "app/popup.html"
  },
  "background": {
    "scripts": [
      "app/vendor.js",
      "app/background.js"
    ]
  },
  "content_scripts": [],
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "optional_permissions": [],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}