Examine source code of Text Cryptor

{
  "manifest_version": 2,
  "name": "Text Cryptor",
  "description": "Encrypts and decrypts text",
  "version": "0.0.1",
  "author": "Dmitry Safarov",
  "browser_action": {
    "default_title": "Text Cryptor",
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "aes.js",
        "cryptor.js"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ]
}