Examine source code of 30c3

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#00daec",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "30c3",
  "manifest_version": 2,
  "description": "Logo of 30C3 by <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/4c43a8b6f174af98c1e2e2d51a2e0fc5a31934f08db4e64f0b8f1592d06fb7dc/http%3A//evelynschubert.com/\">Evelyn Schubert</a>"
}