Examine source code of CP Submit

{
  "name": "CP Submit",
  "description": "A browser extension to auto submit cp problems",
  "version": "1.0",
  "manifest_version": 3,
  "homepage_url": "https://github.com/Vishanth21/cp-submit",
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://codeforces.com/*",
    "http://127.0.0.1/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://codeforces.com/*/submit*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "protocol_handlers": [
    {
      "protocol": "ext+cpsubmit",
      "name": "Handle CP Submit",
      "uriTemplate": "handler.html?data=%s"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cp-submit.nvim@bunSamosa",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}