Examine source code of ItsTheDash

{
  "theme": {
    "images": {
      "theme_frame": "DashMozillaHeader.jpg"
    },
    "colors": {
      "frame": "#046c8f",
      "tab_background_text": "#bab6b6"
    }
  },
  "version": "2.0",
  "name": "ItsTheDash",
  "manifest_version": 2,
  "description": "I'm Dash Maverick. A professional wrestler from South Florida. This is for any fans of Dash Maverick to use as their Firefox theme. <a href=\"https://outgoing.prod.mozaws.net/v1/6d2105afd07d7542844e436b09e76f798ceedbcdaf5aa0324dcff46dc54facfb/http%3A//DashMaverick.com\" rel=\"nofollow\">DashMaverick.com</a>\nAll images used with permission."
}