Examine source code of Kick Stream Embed for DGG

{
  "manifest_version": 2,
  "name": "Kick Stream Embed for DGG",
  "version": "2.0.0",
  "description": "Embed Kick streams on destiny.gg/bigscreen",
  "author": "Liftaris",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "https://*.destiny.gg/bigscreen*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.destiny.gg/bigscreen*"
      ],
      "js": [
        "./content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6c36c6dd-a260-45c8-9340-4bb329d5708a}"
    }
  }
}