Examine source code of PiratesHomestuck

{
  "theme": {
    "images": {
      "theme_frame": "pirates.jpg"
    },
    "colors": {
      "frame": "#c2c2c2",
      "tab_background_text": "#4f4f4f"
    }
  },
  "version": "2.0",
  "name": "PiratesHomestuck",
  "manifest_version": 2
}