Examine source code of Vanitas

{
  "theme": {
    "images": {
      "theme_frame": "firefox_vanitas.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Vanitas",
  "manifest_version": 2,
  "description": "It's not the best in the world, but I wanted to fangirl on Vanitas more often, so...\n>83\nOh..and..spoiler? XD\n\nVanitas (c) Kingdom Hearts (c) Disney and SquareEnix"
}