Examine source code of Test Pilot Constellation

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Test Pilot Constellation",
  "manifest_version": 2,
  "description": "A theme based on testpilot background image <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/0c2983094370322954ab143493a1cccbdf2a55fe70a7717247bebdc9d46c8ca9/https%3A//github.com/mozilla/testpilot\">https://github.com/mozilla/testpilot</a>"
}