Examine source code of Organic Orbs

{
  "theme": {
    "images": {
      "theme_frame": "Organic-Orbs-Persona-Header-KenSaunders.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Organic Orbs",
  "manifest_version": 2,
  "description": "Reveal more of your Personas. Add the following to your userChrome.css. .searchbar-textbox { opacity: 0.4 !important; } .searchbar-textbox[focused=\"true\"]{ opacity: 0.8 !important; } #urlbar { opacity: 0.4 !important; } #urlbar[focused=\"true\"]{ opacity: 0.8 !important; } Original swirl brushes from <a href=\"https://outgoing.prod.mozaws.net/v1/c38ccfb647282c4910d01148300b27c61daded5b1e9821ec4f779b179c33226a/http%3A//nayag.deviantart.com\" rel=\"nofollow\">http://nayag.deviantart.com</a>"
}