Examine source code of Kattis UI Fix

{
  "manifest_version": 2,
  "name": "Kattis UI Fix ",
  "description": "Adds back the old Kattis UI buttons on problem pages as well as a toggle to hide the editor panel.",
  "version": "0.1.5",
  "icons": {
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.kattis.com/problems/*",
        "https://*.kattis.com/contests/*/problems/*"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "content_script.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://open.kattis.com/problems",
        "https://open.kattis.com/problems?*",
        "https://open.kattis.com/problem-authors/*",
        "https://open.kattis.com/problem-sources/*"
      ],
      "js": [
        "auth_sorting.js"
      ],
      "css": [
        "auth_sorting.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{74d47676-e438-4142-a2b6-7659c06991b4}"
    }
  }
}