Examine source code of Password generator

{
  "manifest_version": 2,
  "name": "Password generator",
  "description": "Useful password generator",
  "version": "1.3",
  "browser_action": {
    "default_popup": "html/popup.html"
  },
  "icons": {
    "16": "images/logo-16.png",
    "32": "images/logo-32.png",
    "48": "images/logo-48.png",
    "128": "images/logo-128.png"
  }
}