Examine source code of Purple Grape

{
  "name": "Purple Grape",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "16400.png"
    },
    "colors": {
      "frame": "rgba(26, 24, 33, 1)",
      "tab_background_text": "rgba(162, 155, 176, 1)",
      "toolbar": "rgba(45, 35, 59, 1)",
      "bookmark_text": "rgba(221, 212, 230, 1)",
      "toolbar_field": "rgba(45, 35, 59, 1)",
      "toolbar_field_text": "rgba(221, 212, 230, 1)"
    }
  }
}