Examine source code of Twitch Live Viewer

{
  "manifest_version": 3,
  "name": "Twitch Live Viewer",
  "version": "1.4.6",
  "default_locale": "en",
  "description": "Instantly check who’s live among your followed Twitch channels.",
  "permissions": [
    "storage",
    "identity",
    "alarms",
    "contextMenus",
    "tabs"
  ],
  "host_permissions": [
    "https://api.twitch.tv/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.svg",
      "32": "icons/icon32.svg",
      "48": "icons/icon48.svg",
      "128": "icons/icon128.svg"
    }
  },
  "icons": {
    "16": "icons/icon16.svg",
    "32": "icons/icon32.svg",
    "48": "icons/icon48.svg",
    "128": "icons/icon128.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9f3f91a-7c2a-4f2a-92b0-e83d77f69c6d}",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ]
      }
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/notify.mp3"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "overlayNotification.js"
      ],
      "run_at": "document_idle"
    }
  ]
}