Examine source code of BladeRunner Oldschool2

{
  "name": "BladeRunner",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "runner_head.png"
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgba(255, 205, 3, 1)",
      "frame": "rgba(227, 229, 232, 0)",
      "tab_background_text": "rgba(255, 192, 31, 1)",
      "bookmark_text": "rgba(255, 255, 255, 0)"
    }
  }
}