Examine source code of YouTube_Blocker

{
  "manifest_version": 2,
  "name": "YouTube Blocker",
  "version": "1.0",
  "description": "Blocks access to YouTube with a configurable timer",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs",
    "*://*.youtube.com/*",
    "*://*.youtu.be/*"
  ],
  "content_security_policy": "script-src 'self' 'sha256-uCV/XMVMjPml8F9RvWTfGsPQ/EhhhBz3XeSaAIpui94='; object-src 'self'",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/border-48.png",
      "96": "icons/border-96.png"
    },
    "default_popup": "popup.html",
    "default_title": "YouTube Blocker"
  },
  "icons": {
    "48": "icons/border-48.png",
    "96": "icons/border-96.png"
  },
  "web_accessible_resources": [
    "stop.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6d06dff-0a95-4cb1-8d05-61622cb26bc2}"
    }
  }
}