Examine source code of Blue Trianglify

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Blue Trianglify",
  "manifest_version": 2,
  "description": "Blue triangles from <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/811940ce448f5363c2854f81d8ed8879e4957c8878be341b36c41be1ba6f21c8/https%3A//trianglify.io/\">https://trianglify.io/</a>"
}