Examine source code of Purple Black

{
  "manifest_version": 2,
  "version": "1.5",
  "name": "Black",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 15, 15)",
      "toolbar_text": "rgb(136, 3, 255)",
      "frame": "rgb(39, 39, 39)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(15, 15, 15)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(136, 3, 255)",
      "popup": "rgb(15, 15, 15)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(249, 249, 249)",
      "icons": "rgb(136, 3, 255)",
      "popup_border": "rgb(136, 3, 255)",
      "popup_highlight_text": "rgb(118, 0, 230)",
      "popup_highlight": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(136, 3, 255)",
      "sidebar_text": "rgb(136, 3, 255)",
      "sidebar": "rgb(12, 3, 2)",
      "tab_loading": "rgb(136, 3, 255)",
      "tab_selected": "rgb(249, 249, 240)",
      "tab_text": "rgb(136, 3, 255)",
      "toolbar_bottom_separator": "rgb(136, 3, 255)",
      "toolbar_field_border_focus": "rgb(136, 3, 255)",
      "toolbar_field_border": "rgb(118, 0, 230)",
      "toolbar_field_highlight_text": "rgb(131, 0, 249)",
      "toolbar_field_text_focus": "rgb(136, 3, 255)",
      "toolbar_top_separator": "rgb(136, 3, 255)",
      "toolbar_vertical_separator": "rgb(134, 0, 255)"
    }
  }
}