Examine source code of Purple Dark Grey

{
  "name": "Purple Dark Grey",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Annotation 2020-06-22 202431.png"
    },
    "colors": {
      "frame": "rgba(51, 51, 51, 1)",
      "tab_background_text": "rgba(99, 78, 156, 1)",
      "toolbar": "rgba(36, 35, 35, 1)",
      "bookmark_text": "rgba(99, 78, 156, 1)",
      "toolbar_field": "rgba(74, 74, 74, 1)",
      "toolbar_field_text": "rgba(128, 128, 128, 1)"
    }
  }
}