Examine source code of strong-password

{
  "description": "Simple yet powerful password generator",
  "manifest_version": 2,
  "name": "strong-password",
  "version": "1.1",
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/generate-password.html",
    "default_icon": "icons/padlock.png",
    "theme_icons": [
      {
        "light": "icons/lock-32.png",
        "dark": "icons/padlock.png",
        "size": 32
      }
    ]
  }
}