Examine source code of Openclassrooms Dark Theme

{
  "manifest_version": 2,
  "name": "OC Dark Theme",
  "version": "1.1resigned1",
  "description": "Add a dark theme to Openclassrooms.com",
  "icons": {
    "48": "icons/logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.openclassrooms.com/*"
      ],
      "js": [
        "js/script.js"
      ],
      "css": [
        "css/styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{daa4908d-623c-44f1-92d2-54c28dc0ecb3}"
    }
  }
}