Examine source code of WoWzilla Firefox

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#03fc67"
    }
  },
  "version": "2.0",
  "name": "WoWzilla Firefox",
  "manifest_version": 2,
  "description": "this theme is all about the MMO 'World of Warcraft' with links to a bunch of helpful sites and sites that I would not be able to play the game as easily without this is also customized to my personal characters so it wont really be that great for you lol..."
}