Examine source code of Codeforces Problem Picker

{
  "manifest_version": 3,
  "name": "Codeforces Problem Picker",
  "description": "Choose a random problem from problemset on Codeforces.",
  "version": "1.0",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "matches": [
        "https://codeforces.com/problemset*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "adhamelrouby@aucegypt.edu",
      "strict_min_version": "58.0"
    }
  }
}