Examine source code of Enigma

{
  "manifest_version": 2,
  "name": "Enigma",
  "version": "0.22",
  "description": "Simple and secure password manager.",
  "icons": {
    "16": "Enigma.svg",
    "32": "Enigma.svg",
    "48": "Enigma.svg",
    "96": "Enigma.svg"
  },
  "browser_action": {
    "default_icon": "Enigma.svg",
    "default_title": "Enigma",
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js"
    ]
  },
  "web_accessible_resources": [
    "browser-polyfill.min.js",
    "Enigma.svg",
    "ThreatRecordWhite.svg",
    "ThreatRecord.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9c42a76-6468-4c10-80f7-1dcf721e2cd6}"
    }
  }
}