Examine source code of Colourful lines

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-2.jpg"
    },
    "colors": {
      "frame": "#00bbff",
      "tab_background_text": "#00fffb"
    }
  },
  "version": "2.0",
  "name": "Colourful lines",
  "manifest_version": 2,
  "description": "My first theme. A simple, yet colourful theme."
}