Examine source code of HoroMist

{
  "theme": {
    "images": {
      "theme_frame": "header_horo.jpg"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "HoroMist",
  "manifest_version": 2,
  "description": "Based on a character from the Anime spice and wolf.\n\nUses a fan made image combined with light green clouds to blend with the firefox UI."
}