Examine source code of chroma-clouds

{
  "theme": {
    "images": {
      "theme_frame": "header1.png"
    },
    "colors": {
      "frame": "#ce63ff",
      "tab_background_text": "#9000e3"
    }
  },
  "version": "2.0",
  "name": "chroma-clouds",
  "manifest_version": 2,
  "description": "A colourful nebula on your favorite browser"
}