Examine source code of Stream Ad Muter — ESPN

{
  "manifest_version": 3,
  "name": "Stream Ad Muter — ESPN & Fox",
  "version": "3.0.0",
  "description": "Detects ad breaks on ESPN and Fox Sports live streams and automatically mutes + blacks out the video until the game resumes.",
  "browser_specific_settings": {
    "gecko": {
      "id": "stream-ad-muter@erikreilly.dev",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.espn.com/*",
    "*://*.foxsports.com/*",
    "*://*.fox.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Stream Ad Muter"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.espn.com/*",
        "*://*.foxsports.com/*",
        "*://*.fox.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ]
}