Examine source code of Redline

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Redline",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-008-60d2718f8c915b5ba09f31df5555b459.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(39, 39, 39)",
      "toolbar_text": "rgb(230, 39, 38)",
      "frame": "rgb(73, 73, 73)",
      "tab_background_text": "rgb(210, 67, 67)",
      "toolbar_field": "rgb(229, 229, 229)",
      "toolbar_field_text": "rgb(230, 39, 38)",
      "tab_line": "rgb(168, 168, 168)",
      "popup": "rgb(90, 90, 90)",
      "popup_text": "rgb(210, 67, 67)",
      "tab_loading": "rgb(168, 168, 168)"
    }
  }
}