Examine source code of Cryptography Toolbox

{
  "manifest_version": 2,
  "name": "Cryptography Toolbox",
  "description": "Base64 decryption and encryption, calculation of various SHA values (SHA-1, SHA-256, SHA-384, SHA-512)",
  "version": "1.0",
  "icons": {
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_title": "Cryptography Toolbox",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ae51cf9-9658-4df9-803b-6351dd666568}",
      "strict_min_version": "120.0"
    }
  }
}