Meeting cost: Send an Email instead

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "2.0",
  "manifest_version": 3,
  "name": "Meeting cost: Send an Email instead",
  "description": "Calendar meeting cost calculator",
  "permissions": [],
  "host_permissions": [
    "https://calendar.google.com/*"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://calendar.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; img-src 'self' https: data:; style-src 'unsafe-inline'; font-src 'self'"
  }
}