Examine source code of pastel3

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "pastel",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(206, 234, 247)",
      "toolbar_text": "rgb(248, 112, 140)",
      "frame": "rgb(208, 210, 246)",
      "tab_background_text": "rgb(98, 102, 183)",
      "toolbar_field": "rgb(233, 234, 254)",
      "toolbar_field_text": "rgb(38, 41, 94)",
      "tab_line": "rgb(249, 212, 239)",
      "popup": "rgb(249, 212, 239)",
      "popup_text": "rgb(163, 103, 198)",
      "button_background_active": "rgb(185, 187, 225)",
      "button_background_hover": "rgb(208, 210, 246)",
      "frame_inactive": "rgb(233, 234, 254)",
      "icons_attention": "rgb(98, 102, 183)",
      "icons": "rgb(38, 41, 94)",
      "ntp_background": "rgb(208, 210, 246)",
      "ntp_text": "rgb(38, 41, 94)",
      "popup_border": "rgb(221, 233, 239)",
      "popup_highlight_text": "rgb(248, 112, 140)",
      "popup_highlight": "rgb(38, 41, 94)",
      "sidebar_border": "rgb(171, 58, 82)",
      "sidebar_highlight_text": "rgb(98, 102, 183)",
      "sidebar_highlight": "rgb(53, 57, 132)",
      "sidebar_text": "rgb(98, 102, 183)",
      "sidebar": "rgb(190, 161, 240)",
      "tab_background_separator": "rgb(38, 41, 94)",
      "tab_loading": "rgb(249, 212, 239)",
      "tab_selected": "rgb(249, 212, 239)",
      "tab_text": "rgb(171, 58, 82)",
      "toolbar_bottom_separator": "rgb(206, 234, 247)",
      "toolbar_field_border_focus": "rgb(249, 212, 239)",
      "toolbar_field_border": "rgb(208, 210, 246)",
      "toolbar_field_focus": "rgb(249, 212, 239)",
      "toolbar_field_highlight_text": "rgb(163, 103, 198)",
      "toolbar_field_highlight": "rgb(208, 210, 246)",
      "toolbar_field_separator": "rgb(185, 187, 225)",
      "toolbar_field_text_focus": "rgb(38, 41, 94)",
      "toolbar_top_separator": "rgb(98, 102, 183)",
      "toolbar_vertical_separator": "rgb(220, 143, 159)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07b1b1c1-577c-4a38-bd2d-8724bd9eea8b}"
    }
  }
}