Examine source code of LeetCode Auto Tracker

{
  "manifest_version": 3,
  "name": "LeetCode Auto Tracker",
  "version": "1.0.0",
  "description": "Auto-tracks LeetCode submissions (slug, title, difficulty, language, timestamp) and writes to a markdown log.",
  "permissions": [
    "downloads",
    "storage"
  ],
  "host_permissions": [
    "https://leetcode.com/*",
    "https://www.leetcode.com/*",
    "https://neetcode.io/*",
    "https://www.neetcode.io/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://leetcode.com/problems/*",
        "https://www.leetcode.com/problems/*",
        "https://neetcode.io/*",
        "https://www.neetcode.io/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "LeetCode Auto Tracker",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5e15dc1e-220b-4e52-9178-ac0b03c4be10}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}