Examine source code of Fashionably Late

{
  "manifest_version": 3,
  "name": "Fashionably Late",
  "version": "1.0.0",
  "description": "Smarter Gmail scheduling, send at the right local time for your recipients, never outside your own working hours.",
  "icons": {
    "16": "public/icons/icon-16.png",
    "32": "public/icons/icon-32.png",
    "48": "public/icons/icon-48.png",
    "128": "public/icons/icon-128.png"
  },
  "action": {
    "default_title": "Fashionably Late",
    "default_icon": {
      "16": "public/icons/icon-16.png",
      "32": "public/icons/icon-32.png",
      "48": "public/icons/icon-48.png"
    }
  },
  "options_page": "src/pages/settings/index.html",
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "assets/content-script.ts-loader-D2UBWgnk.js"
      ],
      "matches": [
        "https://mail.google.com/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://mail.google.com/*"
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "resources": [
        "assets/TimezonePicker-LProGQOX.js",
        "assets/storage-C1xEA_Xf.js",
        "assets/messages-FGAoNJMZ.js",
        "assets/recipient-cache-DSBuzizv.js",
        "assets/content-script.ts-D0PACXON.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fashionably-late@fashionablylate.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}