Examine source code of rsbimmortal

{
  "name": "Immortality",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "9d6e267c601ed421092bb4b4d5930e84.jpg"
    },
    "colors": {
      "frame": "rgba(209, 15, 15, 1)",
      "tab_background_text": "rgba(159, 159, 191, 1)",
      "toolbar": "rgba(74, 41, 41, 0.64)",
      "bookmark_text": "rgba(207, 31, 31, 1)",
      "toolbar_field": "rgba(75, 70, 77, 1)",
      "toolbar_field_text": "rgba(15, 8, 8, 1)"
    }
  }
}