Examine source code of Rogue collection

{
  "name": "Rogue collection",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Rogue header 2.png"
    },
    "colors": {
      "frame": "rgba(18, 82, 14, 1)",
      "tab_background_text": "rgba(133, 133, 133, 1)",
      "toolbar": "rgba(17, 77, 20, 0.43)",
      "bookmark_text": "rgba(245, 241, 17, 1)",
      "toolbar_field": "rgba(255, 255, 28, 0.31)",
      "toolbar_field_text": "rgba(3, 3, 3, 1)"
    }
  }
}