Examine source code of TOTP

{
  "manifest_version": 2,
  "name": "TOTP",
  "version": "1.2.8",
  "browser_specific_settings": {
    "gecko": {
      "id": "totp@ohzd.od",
      "strict_min_version": "67.0"
    }
  },
  "browser_action": {
    "default_popup": "form.html#popup",
    "default_area": "navbar"
  },
  "icons": {
    "128": "totp.png"
  }
}