Examine source code of The Gutter

{
  "theme": {
    "images": {
      "theme_frame": "head.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "The Gutter",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/96ea28bcc8dbf309773c134eb7281a717965b2fed1fad920fa91057c958b1861/http%3A//www.thegutterandthegold.com\" rel=\"nofollow\">http://www.thegutterandthegold.com</a>"
}