Examine source code of SeaShells

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "SeaShells",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(23, 56, 76)",
      "toolbar_text": "rgb(97, 140, 152)",
      "frame": "rgb(8, 19, 26)",
      "tab_background_text": "rgb(97, 140, 152)",
      "toolbar_field": "rgb(8, 19, 26)",
      "toolbar_field_text": "rgb(97, 140, 152)",
      "tab_line": "rgb(222, 184, 141)",
      "popup": "rgb(23, 56, 76)",
      "popup_text": "rgb(222, 184, 141)",
      "button_background_active": "rgb(8, 19, 26)",
      "frame_inactive": "rgb(14, 24, 32)",
      "icons_attention": "rgb(208, 80, 35)",
      "icons": "rgb(222, 184, 141)",
      "ntp_background": "rgb(8, 19, 26)",
      "ntp_text": "rgb(222, 184, 141)",
      "popup_border": "rgb(222, 184, 141)",
      "popup_highlight_text": "rgb(222, 184, 141)",
      "popup_highlight": "rgb(23, 56, 76)",
      "sidebar_highlight": "rgb(23, 56, 76)",
      "sidebar_text": "rgba(253, 210, 158, 0.68)",
      "sidebar": "rgb(8, 19, 26)",
      "tab_selected": "rgb(23, 56, 76)",
      "tab_text": "rgb(253, 210, 158)",
      "toolbar_bottom_separator": "rgba(253, 210, 158, 0.51)",
      "toolbar_field_border_focus": "rgb(97, 140, 152)",
      "toolbar_field_border": "rgb(97, 140, 152)",
      "toolbar_field_focus": "rgb(8, 19, 26)",
      "toolbar_field_highlight_text": "rgb(253, 210, 158)",
      "toolbar_field_highlight": "rgb(2, 123, 155)",
      "toolbar_field_text_focus": "rgb(97, 140, 152)",
      "tab_loading": "rgb(222, 184, 141)"
    }
  }
}