Examine source code of Proton Red

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Proton Red",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(23, 23, 23)",
      "toolbar_text": "rgb(234, 234, 234)",
      "frame": "rgb(56, 0, 2)",
      "tab_background_text": "rgb(185, 185, 185)",
      "toolbar_field": "rgb(56, 0, 2)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(23, 23, 23)",
      "popup": "rgb(23, 23, 23)",
      "popup_text": "rgb(214, 214, 214)",
      "button_background_active": "rgb(22, 22, 22)",
      "button_background_hover": "rgba(60, 60, 60, 0.65)",
      "frame_inactive": "rgb(44, 0, 2)",
      "icons_attention": "rgb(249, 249, 249)",
      "icons": "rgb(169, 165, 165)",
      "ntp_background": "rgb(23, 23, 23)",
      "ntp_text": "rgb(155, 155, 155)",
      "popup_border": "rgb(55, 0, 0)",
      "popup_highlight_text": "rgb(0, 0, 0)",
      "popup_highlight": "rgb(207, 207, 207)",
      "sidebar_border": "rgb(55, 0, 0)",
      "sidebar_highlight_text": "rgb(10, 10, 10)",
      "sidebar_highlight": "rgb(206, 202, 202)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(23, 23, 23)",
      "tab_background_separator": "rgb(172, 172, 172)",
      "tab_selected": "rgb(23, 23, 23)",
      "toolbar_field_border_focus": "rgb(30, 30, 30)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "tab_loading": "rgb(23, 23, 23)"
    }
  }
}