Examine source code of Rubyon Red

{
  "theme": {
    "images": {
      "theme_frame": "ruby.png"
    },
    "colors": {
      "frame": "#f28080",
      "tab_background_text": "#5c5959"
    }
  },
  "version": "2.0",
  "name": "Rubyon Red",
  "manifest_version": 2,
  "description": "Ruby red"
}