Examine source code of ArenaSwap

{
  "manifest_version": 3,
  "name": "ArenaSwap",
  "description": "Watches every live game across 12 leagues and auto-switches your browser tab to the most exciting one every 15 seconds.",
  "version": "1.4.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "arenaswap@hiteacheryouare.github.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "https://site.api.espn.com/*",
    "https://a.espncdn.com/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; img-src 'self' https://a.espncdn.com data:;"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "ArenaSwap",
    "default_popup": "popup.html"
  }
}