Examine source code of Protonord

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Protonord",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(46, 52, 64)",
      "toolbar_text": "rgb(236, 239, 244)",
      "frame": "rgb(59, 66, 82)",
      "tab_background_text": "rgb(236, 239, 244)",
      "toolbar_field": "rgb(76, 86, 106)",
      "toolbar_field_text": "rgb(236, 239, 244)",
      "tab_line": "rgba(136, 192, 208, 0)",
      "popup": "rgb(46, 52, 64)",
      "popup_text": "rgb(236, 239, 244)",
      "frame_inactive": "rgba(76, 86, 106, 0.75)",
      "icons_attention": "rgb(235, 203, 139)",
      "icons": "rgb(236, 239, 244)",
      "popup_border": "rgba(236, 239, 244, 0)",
      "tab_selected": "rgb(136, 192, 208)",
      "tab_text": "rgb(59, 66, 82)",
      "toolbar_field_border": "rgb(76, 86, 106)",
      "toolbar_field_highlight": "rgb(191, 97, 106)",
      "tab_loading": "rgba(136, 192, 208, 0)"
    }
  }
}