Examine source code of Carbon Lite

{
  "theme": {
    "images": {
      "theme_frame": "CL_Header.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Carbon Lite",
  "manifest_version": 2,
  "description": "Download the custom \"Carbon\" Firefox icon to match this theme \n<a href=\"https://outgoing.prod.mozaws.net/v1/37e81c8f644e1b8108c212dfefb7f37f5c0c1e4987d15851a465b56e2093385e/http%3A//leo6247.deviantart.com/art/Carbon-Firefox-109314348%23\" rel=\"nofollow\">here</a>"
}