Examine source code of Secure Email Converter

{
  "manifest_version": 2,
  "name": "Secure Email Converter",
  "version": "1.1.8resigned1",
  "author": "StayPrivate Ltd",
  "description": "Converts email addresses to their secure equivalents.",
  "permissions": [
    "contextMenus",
    "storage",
    "management",
    "tabs",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "38": "icon-38.png",
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{33c2a6b1-778e-4ef8-850b-6f4a29ae821a}"
    }
  }
}