Examine source code of SAO Simple Dark Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#595959",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "SAO Simple Dark Theme",
  "manifest_version": 2,
  "description": "A simple dark theme with Sword Art Online in the top right. Please comment if you can find the Easter Egg and also name the anime it's from. I'll put the answer in the description on Holoween 10/30/2015 -8.00PST."
}