Examine source code of LetSolve Promblem Tracker

{
  "manifest_version": 2,
  "name": "LetSolve Problem Tracker",
  "version": "1.0.3",
  "description": "Organize CP problems with MetaData",
  "permissions": [
    "storage",
    "tabs",
    "*://*.codeforces.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "letsolver-organizer2@shekhar-extension",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "browsingActivity"
        ],
        "access_agreement": "explicit"
      }
    }
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.codeforces.com/*/problem/*",
        "*://*.codeforces.com/contest/*/problem/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  }
}