Examine source code of Competitive Companion

{
  "manifest_version": 3,
  "name": "Competitive Companion",
  "description": "Parses competitive programming problems and sends them to various tools like CP Editor and CPH.",
  "version": "2.64.0",
  "author": "Jasper van Merle",
  "homepage_url": "https://github.com/jmerle/competitive-companion",
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "http://localhost/"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "19": "icons/icon-19.png",
    "20": "icons/icon-20.png",
    "24": "icons/icon-24.png",
    "32": "icons/icon-32.png",
    "38": "icons/icon-38.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "action": {
    "default_title": "Parse task",
    "default_icon": {
      "16": "icons/icon-16.png",
      "19": "icons/icon-19.png",
      "20": "icons/icon-20.png",
      "24": "icons/icon-24.png",
      "32": "icons/icon-32.png",
      "38": "icons/icon-38.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    }
  },
  "optional_permissions": [
    "https://codejam.googleapis.com/dashboard/get_file/*",
    "https://api.tlx.toki.id/v2/*",
    "https://resources.beecrowd.com/*"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74e326aa-c645-4495-9287-b6febc5565a7}",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    }
  }
}