Examine source code of play-vulkancom

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e2e4eb",
      "tab_background_text": "#800c0c"
    }
  },
  "version": "2.0",
  "name": "play-vulkancom",
  "manifest_version": 2,
  "description": "<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/c269c8e6453700d040a328072fa22163bd24cb1ddfe4ac16d4e4abf96ef7019a/https%3A//play-vulkan.com/\">https://play-vulkan.com/</a>  - main theme for best online games"
}