Examine source code of Simple Minimal Grey

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#D7D7D7",
      "tab_background_text": "#004BAF"
    }
  },
  "version": "2.0",
  "name": "Simple Minimal Grey",
  "manifest_version": 2,
  "description": "For those who just want nothing more than a light, simple grey that perfectly suits your eye and browser."
}