Examine source code of A River Runs Through It

{
  "theme": {
    "images": {
      "theme_frame": "ARiverRunsThroughItHeaderbySaskya.jpg"
    },
    "colors": {
      "frame": "#c00402",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "A River Runs Through It",
  "manifest_version": 2,
  "description": "A river of molten lava, that is. What is it running through? You decide."
}