Examine source code of Gecko Rocks

{
  "theme": {
    "images": {
      "theme_frame": "Gecko-Persona-Header-3000x200.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Gecko Rocks",
  "manifest_version": 2,
  "description": "This Persona (and all others), doesn't look good with the Menu Bar hidden.\nTabs on Top are fine, but it looks even better with the tabs on the bottom.\n\nabout:config &gt; browser.tabs.onTop &gt; false\n\nGecko logo from:\n<a href=\"https://outgoing.prod.mozaws.net/v1/178aa1b1c20af68e226f39865ca7a757c71fceed28884a7b89b9acb388de8083/http%3A//www.mozilla.org/en-US/products/\" rel=\"nofollow\">http://www.mozilla.org/en-US/products/</a>"
}