Examine source code of deactivate-autocomplete

{
  "manifest_version": 2,
  "name": "deactivate-autocomplete",
  "version": "1.0",
  "description": "Deactivates autocomplete on any pages. Every input gets 'autocomplete=off'.",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "autocomplete-off.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c91956d0-5f0d-489a-bfe2-c39343dcc62c}"
    }
  }
}