Examine source code of SpareTime

{
  "theme": {
    "images": {
      "theme_frame": "Persona02.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "SpareTime",
  "manifest_version": 2,
  "description": "Just a blur of my blog-design\n(<a href=\"https://outgoing.prod.mozaws.net/v1/e523d26ef3c2568677b43042da9a11a017418b0a92495aa79be4888496f864f4/http%3A//sebverliefde.blogspot.com\" rel=\"nofollow\">http://sebverliefde.blogspot.com</a>)"
}