Examine source code of Password viewer

{
  "manifest_version": 2,
  "name": "Password viewer",
  "version": "1.0.2",
  "description": "Makes a password field visible when you hover the mouse over it.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "js": [
        "content/change-pwd-field-types.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ]
}