Examine source code of CPH Submit Pro

{
  "name": "CPH Submit Pro",
  "author": "codewithsathya@gmail.com",
  "homepage_url": "https://github.com/codewithsathya/cph-submit",
  "version": "1.0.0",
  "description": "Codeforces Submit add-on for Competitive Programming Helper.",
  "icons": {
    "48": "icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://cses.fi/problemset",
        "https://cses.fi/problemset/",
        "https://cses.fi/problemset/list",
        "https://cses.fi/problemset/list/"
      ],
      "js": [
        "/dist/csesRetriever.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "manifest_version": 2,
  "permissions": [
    "scripting",
    "*://codeforces.com/*",
    "*://cses.fi/*",
    "webNavigation",
    "storage"
  ],
  "background": {
    "scripts": [
      "dist/backgroundScript.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{20b75a32-7833-49b0-9b8c-360e8e04772a}",
      "strict_min_version": "58.0"
    }
  }
}