Examine source code of Freewave

{
  "theme": {
    "images": {
      "theme_frame": "headcopy.jpg"
    },
    "colors": {
      "frame": "#858585",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Freewave",
  "manifest_version": 2,
  "description": "Freewave, created by <a href=\"https://outgoing.prod.mozaws.net/v1/5a0ca2d686b16a1b90995507e95e2fe9c5262baecf51ea21742ab337016324ea/http%3A//www.ionee.org\" rel=\"nofollow\">www.ionee.org</a>\nblue and grey, it will really open your mind!"
}