Examine source code of Hard at Work

{
  "theme": {
    "images": {
      "theme_frame": "sherlock_4.png"
    },
    "colors": {
      "frame": "#b6ab7e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Hard at Work",
  "manifest_version": 2,
  "description": "Sherlock BBC's Sherlock Holmes (Benedict Cumberbach) and John Watson (Martin Freeman) discuss the newspaper over a meal."
}