'Sent to' Email Copier

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "'Sent to' Email Copier",
  "version": "1.0.7",
  "description": "Copies email adress of who the email was sent to",
  "permissions": [
    "tabs"
  ],
  "host_permissions": [
    "https://mail.google.com/mail/u/*"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/mail/u/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/copy-32.png"
      ],
      "matches": [
        "https://*.mail.google.com/*"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "assets/copy-16.png",
      "24": "assets/copy-24.png",
      "32": "assets/copy-32.png",
      "128": "assets/copy-128.png"
    },
    "default_title": "Sent to email copier"
  },
  "icons": {
    "16": "assets/copy-16.png",
    "24": "assets/copy-24.png",
    "32": "assets/copy-32.png",
    "128": "assets/copy-128.png"
  },
  "manifest_version": 3
}