Examine source code of CSES Problem Tracker

{
  "manifest_version": 3,
  "name": "CSES Problem Tracker",
  "version": "3.0",
  "description": "Track CSES progress, streaks, daily goals, heatmap, notes, and a VS Code-style code editor.",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://cses.fi/problemset/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cses-tracker@mycustomdomain.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icon.jpeg"
  }
}