Examine source code of Black-Dress 2

{
  "name": "Black-Dress 2",
  "manifest_version": 2,
  "version": "3.1resigned1",
  "theme": {
    "images": {
      "headerURL": "Ued-15.jpg"
    },
    "colors": {
      "accentcolor": "rgba(229, 230, 232, 1)",
      "textcolor": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3982c9ea-b726-4e1c-83df-1843a148fb7d}"
    }
  }
}