Examine source code of GCal Pro: Custom Colors for Google Calendar

{
  "manifest_version": 3,
  "name": "GCal Pro: Custom Colors for Google Calendar",
  "description": "Customize Google Calendar events with more colors for better organization and readability, no OAuth required!",
  "version": "1.0.8",
  "options_ui": {
    "page": "src/pages/options/index.html"
  },
  "action": {
    "default_popup": "src/pages/popup/index.html",
    "default_icon": {
      "32": "icon32.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://www.google-analytics.com/*",
    "https://api.lemonsqueezy.com/*",
    "https://api.gumroad.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "assets/index.tsx-loader-DeF1EebG.js"
      ],
      "matches": [
        "https://calendar.google.com/*"
      ],
      "css": [
        "contentStyle.css",
        "assets/index-C1W0oTq3.css"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://calendar.google.com/*"
      ],
      "resources": [
        "contentStyle.css",
        "icon128.png",
        "icon32.png",
        "assets/storage-8g1oKRRZ.js",
        "assets/pickr.min-8elHrRYc.js",
        "assets/index.tsx-DqfOOeJW.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "aydinimranov2022@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  }
}