Examine source code of StackAtNight

{
  "manifest_version": 2,
  "author": "https://github.com/temannin",
  "name": "StackAtNight",
  "version": "1.3resigned1",
  "description": "Extension that turns your StackOverflow to night mode. ",
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_start",
      "matches": [
        "*://*.stackoverflow.com/*"
      ],
      "css": [
        "night.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2472b849-66f0-4640-909b-561674b5d200}"
    }
  }
}