Examine source code of Yaru Dark Theme

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Yaru Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(30, 30, 30)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(19, 19, 19)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(52, 52, 52)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(30, 30, 30)",
      "popup": "rgb(48, 48, 48)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(233, 84, 32)",
      "ntp_background": "rgb(30, 30, 30)",
      "popup_highlight": "rgb(233, 84, 32)",
      "sidebar_highlight": "rgb(233, 84, 32)",
      "sidebar": "rgb(48, 48, 48)",
      "tab_loading": "rgb(233, 84, 32)",
      "toolbar_bottom_separator": "rgb(30, 30, 30)",
      "toolbar_field_border_focus": "rgb(233, 84, 32)",
      "toolbar_field_highlight": "rgb(233, 84, 32)",
      "toolbar_top_separator": "rgb(30, 30, 30)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{368c84da-f9a5-4043-82fd-9452fc3d4184}"
    }
  }
}