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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Insert and Send HTML with Gmail",
  "short_name": "Insert and Send HTML with Gmail",
  "description": "Easily insert custom HTML into your Gmail emails with this handy extension. Create and preview your custom emails directly in Gmail.",
  "version": "1.0.13",
  "permissions": [
    "scripting",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "*://mail.google.com/*",
    "*://inbox.google.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*",
        "*://inbox.google.com/*"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/content.css"
      ]
    }
  ],
  "background": {
    "service_worker": "js/background.js"
  },
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "resources/*"
      ],
      "matches": [
        "*://mail.google.com/*",
        "*://inbox.google.com/*"
      ]
    }
  ],
  "manifest_version": 3
}