Examine source code of LionHearted

{
  "theme": {
    "images": {
      "theme_frame": "lionhearted-ff-persona-header2.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "LionHearted",
  "manifest_version": 2,
  "description": "Grayed out isometric view of the word LION, used as background at the LionHearted blog <a href=\"https://outgoing.prod.mozaws.net/v1/116d3104e11bcb8e50555b4ee6191b92444132581294ba3831e4bc297d566568/http%3A//lionel.valdellon.com\" rel=\"nofollow\">http://lionel.valdellon.com</a>"
}