Examine source code of close button

{
  "manifest_version": 2,
  "name": "close button",
  "version": "1",
  "description": "Automatically bypasses and clicks a close button.",
  "permissions": [
    "*://www.wco.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.wco.tv/*",
        "*://embed.wcostream.com/*"
      ],
      "all_frames": true,
      "js": [
        "closeButton.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b01a8ec8-cf87-4514-980d-377b8c6b8109}"
    }
  }
}