Examine source code of SpoilerBlock

{
  "manifest_version": 2,
  "name": "spoilerBlock",
  "description": "Attempt to hide sport results from youtube secondary search",
  "version": "1.3resigned1",
  "author": "isolomak",
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "js": [
        "extension.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d51b216-35cc-4366-a229-47d1aa9f6082}"
    }
  }
}