Examine source code of Hatsune_Miku_PD

{
  "theme": {
    "images": {
      "theme_frame": "Hatsune_Miku_PD_FireFox_Header_by_olivaaa.jpg"
    },
    "colors": {
      "frame": "#8071e6",
      "tab_background_text": "#3013ed"
    }
  },
  "version": "2.0",
  "name": "Hatsune_Miku_PD",
  "manifest_version": 2,
  "description": "Hatsune Miku saw this graphic out there on the net and wanted to submit it for the rest of the world."
}