Examine source code of Fire.NET

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Fire.NET",
  "manifest_version": 2,
  "description": "Fire! (tutorial at <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b421c06731e1e0cc9ac71af5bbfdc3ef3d0a9d217ead894d8b22b96f461d2947/http%3A//paintdotnet.forumer.com/viewtopic.php%3Ff=31&amp;t=26966%29\">http://paintdotnet.forumer.com/viewtopic.php?f=31&amp;t=26966)</a>"
}