Examine source code of Code Notes

{
  "manifest_version": 3,
  "name": "Code Notes",
  "version": "1.0.0",
  "description": "Developer note-taking tool with local file system sync.",
  "browser_specific_settings": {
    "gecko": {
      "id": "codenotes@tanmay1301",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "sidebar_action": {
    "default_panel": "index.html",
    "default_icon": "favicon.svg",
    "default_title": "Code Notes Sidebar"
  },
  "permissions": [
    "activeTab",
    "nativeMessaging",
    "storage"
  ],
  "host_permissions": [
    "*://*.leetcode.com/problems/*",
    "*://*.codeforces.com/problemset/problem/*",
    "*://*.codeforces.com/contest/*/problem/*",
    "*://*.codeforces.com/gym/*/problem/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.leetcode.com/problems/*",
        "*://*.codeforces.com/problemset/problem/*",
        "*://*.codeforces.com/contest/*/problem/*",
        "*://*.codeforces.com/gym/*/problem/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}