Examine source code of Twitch Chat Overlay

{
  "manifest_version": 2,
  "name": "Twitch Chat Overlay",
  "version": "1.0.0",
  "description": "Overlay chat for Twitch fullscreen mode",
  "permissions": [
    "storage",
    "*://*.twitch.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "twitch-chat-overlay@oskobri",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}