Examine source code of Ska Checkers

{
  "theme": {
    "images": {
      "theme_frame": "firefox1.png"
    },
    "colors": {
      "frame": "#f20000",
      "tab_background_text": "#f20000"
    }
  },
  "version": "2.0",
  "name": "Ska Checkers",
  "manifest_version": 2,
  "description": "A ska-worthy background. Simple, but great."
}