Examine source code of Smooth Green Flow

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#f2f2f2",
      "tab_background_text": "#2b2b2b"
    }
  },
  "version": "2.0",
  "name": "Smooth Green Flow",
  "manifest_version": 2,
  "description": "Solid green with subtle gradients"
}