Examine source code of Sonic Stadium Sonical

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sonic Stadium Sonical",
  "manifest_version": 2,
  "description": "Based on the default theme of the Sonic Stadium message board (<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/3e1f0a2ddb898eae528f05bc55abe6c44089e26b2f7aeb444cec6722f7c55551/https%3A//board.sonicstadium.org/%29\">https://board.sonicstadium.org/)</a>."
}