NoMailto:

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "NoMailto:",
  "version": "0.2.2",
  "browser_action": {
    "default_icon": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery.min.js",
        "jquery.modal.min.js",
        "clipboard.min.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "nmtstyles.css"
  ]
}