Examine source code of Security Password Builder

{
  "description": "Security Passworte erzeugen. Aus einfachen, leicht zu merkenden Eingaben bildet SPB komplexe und sichere Passworte.",
  "manifest_version": 2,
  "name": "Security Password Builder",
  "version": "0.0.3.9resigned1",
  "homepage_url": "https://passworten.de",
  "icons": {
    "32": "spbBtn32.png",
    "48": "spbBtn48.png"
  },
  "applications": {
    "gecko": {
      "id": "spb@passworten.de"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus",
    "clipboardWrite",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "spbBtn32.png",
    "theme_icons": [
      {
        "light": "spbBtn32.png",
        "dark": "spbBtnInvert32.png",
        "size": 32
      }
    ],
    "default_title": "Security Password Builder",
    "default_popup": "popup/main/main.html"
  }
}