Examine source code of Transitions

{
  "theme": {
    "images": {
      "theme_frame": "BL_personas1.png"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Transitions",
  "manifest_version": 2,
  "description": "To launch <a href=\"https://outgoing.prod.mozaws.net/v1/b0bda2b9a8c02ba7fee462336de39a31b173e452aefd5b3aa8d9e9b9ca257019/http%3A//BoldLab.com\" rel=\"nofollow\">BoldLab.com</a>'s new image, I designed this Persona design...I hope you enjoy it!"
}