Examine source code of nosnowcf

{
  "manifest_version": 2,
  "name": "nosnowcf",
  "version": "2.0",
  "description": "Disables snow on codeforces, thanks to https://codeforces.com/blog/entry/85729 and https://codeforces.com/profile/Actium. Also, now narrows down the problem statement for better readability.",
  "permissions": [
    "https://codeforces.com/"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://codeforces.com/**"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f0619cc-801b-48e7-ae8a-d32fcd6907e2}"
    }
  }
}