Examine source code of Marillion-Marbles

{
  "theme": {
    "images": {
      "theme_frame": "discovermarbles.png"
    },
    "colors": {
      "frame": "#1d8f6b",
      "tab_background_text": "#191621"
    }
  },
  "version": "2.0",
  "name": "Marillion-Marbles",
  "manifest_version": 2,
  "description": "From Marillion's Marbles"
}