HTML template Gmail

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "HTML template Gmail",
  "short_name": "mail-tmplt",
  "version": "0.0.3",
  "description": "Apply html templates to mails",
  "minimum_chrome_version": "18",
  "icons": {
    "16": "ico-16.png",
    "48": "ico-48.png",
    "128": "ico-128.png"
  },
  "permissions": [
    "*://mail.google.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "template.js"
      ],
      "run_at": "document_end"
    }
  ]
}