Examine source code of Dont Panic H2G2

{
  "theme": {
    "images": {
      "theme_frame": "personasdontpanic.png"
    },
    "colors": {
      "frame": "#ababab",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dont Panic H2G2",
  "manifest_version": 2,
  "description": "Don't Panic from H2G2!"
}