Examine source code of Simple & clean

{
  "theme": {
    "images": {
      "theme_frame": "top.png"
    },
    "colors": {
      "frame": "#496061",
      "tab_background_text": "#262626"
    }
  },
  "version": "2.0",
  "name": "Simple & clean",
  "manifest_version": 2,
  "description": "I just wanted something simple and clean, so I made this. Light-blue gradient white."
}