Examine source code of CodeBlur AntiSpoiler

{
  "manifest_version": 3,
  "name": "CodeBlur - Anti-Spoiler for Coding",
  "version": "1.1",
  "description": "Automatically blurs code editors on solved problems to prevent spoilers. Works on LeetCode & GeeksforGeeks with instant toggle control.",
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "codeblur@antispoiler.dev"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/problems/*",
        "https://www.geeksforgeeks.org/problems/*"
      ],
      "js": [
        "background.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ]
}