Examine source code of Skipper

{
  "manifest_version": 3,
  "name": "Skipper",
  "version": "1.0",
  "description": "Press Shift + S to skip the ad in the player",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "img/logo/SkiperLogo128.png",
    "48": "img/logo/SkiperLogo128.png",
    "128": "img/logo/SkiperLogo128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{740f9756-d5fe-4336-b13f-52343ccf86c3}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "blockPopups.js"
      ],
      "all_frames": true,
      "world": "MAIN",
      "run_at": "document_start"
    }
  ]
}