Examine source code of Subway man

{
  "theme": {
    "images": {
      "theme_frame": "firefoxbannersubwayguyred.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#d6d6d6"
    }
  },
  "version": "2.0",
  "name": "Subway man",
  "manifest_version": 2,
  "description": "Banner for my upcoming band, don't have a name yet, the subway guy is in a scuba suit"
}