Examine source code of SteamOS Purple

{
  "name": "SteamOS Purple",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "undefined - Imgur.png"
    },
    "colors": {
      "frame": "rgba(44, 49, 61, 1)",
      "tab_background_text": "rgba(123, 100, 163, 1)",
      "toolbar": "rgba(30, 27, 43, 1)",
      "bookmark_text": "rgba(237, 222, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(237, 212, 255, 1)",
      "tab_line": "rgba(187, 158, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e2e65b2-b8d0-4e0e-b450-d2863d3f7a0c}"
    }
  }
}