Examine source code of EZ-MuteDomain

{
  "manifest_version": 3,
  "name": "Muter",
  "version": "1.0.0",
  "description": "Auto-mutes tabs for specified websites",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "muter@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/mute.svg"
  },
  "icons": {
    "128": "icons/mute.svg"
  }
}