Examine source code of Sky Lights dark

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#42033c",
      "tab_background_text": "#c7b2ff"
    }
  },
  "version": "2.0",
  "name": "Sky Lights dark",
  "manifest_version": 2,
  "description": "Part of a self-made acrylic picture (on my website)"
}