Examine source code of Simple Transition

{
  "theme": {
    "images": {
      "theme_frame": "simpletransition.jpg"
    },
    "colors": {
      "frame": "#607cb8",
      "tab_background_text": "#485363"
    }
  },
  "version": "2.0",
  "name": "Simple Transition",
  "manifest_version": 2,
  "description": "Just wanted a simple light theme... Hope it looks ok!"
}