Examine source code of Deep Dark Blue Forest

{
  "theme": {
    "images": {
      "theme_frame": "h_darkforest.jpg"
    },
    "colors": {
      "frame": "#000030",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Deep Dark Blue Forest",
  "manifest_version": 2,
  "description": "nature pretty dark fantasy deep surreal beautiful branches trees wood magic goth gothic horror magical scary woods blue black green sky insekts flyes night twilight pretty sad alone spooky"
}