Examine source code of ColourBurst

{
  "theme": {
    "images": {
      "theme_frame": "Flowerburst.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "ColourBurst",
  "manifest_version": 2,
  "description": "Made with a beautiful free vector from <a href=\"https://outgoing.prod.mozaws.net/v1/f82f1dc93cc97b1ff8013996cabf2846a71743b020579349b0c7510202f03ac6/http%3A//Vectorious.net\" rel=\"nofollow\">Vectorious.net</a>. Simply some of the best vectors available. One day maybe I'll be able to produce stuff like that."
}