Examine source code of Small River

{
  "theme": {
    "images": {
      "theme_frame": "small-river_01.jpg"
    },
    "colors": {
      "frame": "#646930",
      "tab_background_text": "#feffbd"
    }
  },
  "version": "2.0",
  "name": "Small River",
  "manifest_version": 2,
  "description": "小川・・・巾は30cmにも満たない世界。\nそれでも活気に満ちた自然の息吹きを感じる。"
}