Examine source code of SpoilerNoNo

{
  "manifest_version": 2,
  "name": "SpoilerNoNo",
  "version": "1.0",
  "description": "Hides Youtube videos containing keywords",
  "icons": {
    "48": "img/48.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "spoilernono.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "spoilernono@example.com"
    }
  },
  "options_ui": {
    "page": "home.html"
  },
  "permissions": [
    "storage"
  ]
}