Examine source code of Cubic

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Cubic",
  "manifest_version": 2,
  "description": "To go with Stylish upload your own :\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/947bec7f892e304e2868ae6209d87259c20e0476f9a03883918853e263b265c7/https%3A//s-media-cache-ak0.pinimg.com/originals/1e/e9/ea/1ee9ea9fb7e6b452ab338e04d334b74a.jpg\">https://s-media-cache-ak0.pinimg.com/originals/1e/e9/ea/1ee9ea9fb7e6b452ab338e04d334b74a.jpg</a>\nDark URL and Search Bar :\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/8f5c37f0beb4b3f55cb0a4efdc9f377b54b3d8a60ca83bfdf43dc8ce3d75ed75/https%3A//userstyles.org/styles/116570/firefox-dark-url-and-search-bar\">https://userstyles.org/styles/116570/firefox-dark-url-and-search-bar</a>"
}