Examine source code of Red Shade

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Red Shade",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(236, 236, 236)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(199, 187, 187)",
      "toolbar_field": "rgb(16, 16, 17)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(252, 236, 219, 0.76)",
      "popup": "rgb(17, 18, 18)",
      "popup_text": "rgb(219, 219, 219)",
      "button_background_hover": "rgba(255, 2, 2, 0.37)",
      "ntp_background": "rgba(6, 6, 6, 0.88)",
      "popup_border": "rgba(249, 0, 0, 0.37)",
      "popup_highlight": "rgba(255, 0, 0, 0.37)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(253, 6, 16)",
      "tab_loading": "rgb(200, 119, 28)",
      "tab_selected": "rgba(188, 42, 42, 0.72)",
      "toolbar_bottom_separator": "rgba(188, 42, 42, 0.72)",
      "toolbar_field_border_focus": "rgba(255, 0, 0, 0.37)",
      "toolbar_field_border": "rgba(255, 2, 2, 0.37)",
      "toolbar_field_highlight": "rgba(252, 5, 5, 0.37)",
      "toolbar_field_separator": "rgba(200, 174, 174, 0.37)",
      "toolbar_top_separator": "rgba(249, 0, 0, 0.37)",
      "toolbar_vertical_separator": "rgba(255, 2, 3, 0.88)"
    }
  }
}