Examine source code of Black cat99

{
  "theme": {
    "images": {
      "theme_frame": "macs.jpg"
    },
    "colors": {
      "frame": "#5c1111",
      "tab_background_text": "#610b0b"
    }
  },
  "version": "2.0",
  "name": "Black cat99",
  "manifest_version": 2
}