Examine source code of strange night sky

{
  "theme": {
    "images": {
      "theme_frame": "strange_night_sky_header.jpg"
    },
    "colors": {
      "frame": "#c2c2c2",
      "tab_background_text": "#d488d3"
    }
  },
  "version": "2.0",
  "name": "strange night sky",
  "manifest_version": 2
}