Examine source code of Password badge toggler

{
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "form-password-unhider.js"
      ],
      "css": [
        "form-password-unhider.css"
      ]
    }
  ],
  "description": "It adds a small badge near password inputs in form to show/hide their content",
  "developer": {
    "name": "Roberto Metere"
  },
  "manifest_version": 2,
  "name": "Form password unhider",
  "version": "0.2",
  "icons": {
    "128": "form-password-unhider.png"
  }
}