Examine source code of Whellbarrow Man

{
  "theme": {
    "images": {
      "theme_frame": "MK_wheelbarrowman.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Whellbarrow Man",
  "manifest_version": 2,
  "description": "Abstract art by Marianne Kugler:\n<a href=\"https://outgoing.prod.mozaws.net/v1/9ce07c67ea4da4ffad27f9b3c99b20281b2c0e945cf3411db5cc04db585daef3/http%3A//www.mariannekugler.com/\" rel=\"nofollow\">http://www.mariannekugler.com/</a>"
}