Examine source code of Nellie

{
  "theme": {
    "images": {
      "theme_frame": "nel1.jpg"
    },
    "colors": {
      "frame": "#db1414",
      "tab_background_text": "#1760d4"
    }
  },
  "version": "2.0",
  "name": "Nellie",
  "manifest_version": 2
}