Examine source code of Twitch NIGHT

{
  "manifest_version": 2,
  "name": "Twitch-NIGHT",
  "version": "0.0.4",
  "description": "New night mode for Twitch.tv and mini fix ui",
  "content_scripts": [
    {
      "all_frames": true,
      "css": [
        "style.css"
      ],
      "matches": [
        "*://twitch.tv/*",
        "*://www.twitch.tv/*"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "logo.png"
  }
}