Examine source code of Welle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Welle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-012-1e971c5fbb8dec3acbd76dd6c6819de9.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(16, 34, 30, 0.67)",
      "toolbar_text": "rgba(42, 149, 238, 0.7)",
      "frame": "rgb(18, 42, 60)",
      "tab_background_text": "rgb(149, 149, 144)",
      "toolbar_field": "rgb(55, 80, 102)",
      "toolbar_field_text": "rgb(201, 239, 245)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(24, 156, 180)",
      "button_background_active": "rgb(38, 72, 102)",
      "button_background_hover": "rgb(20, 142, 164)",
      "frame_inactive": "rgba(53, 57, 57, 0.54)",
      "icons_attention": "rgba(20, 151, 52, 0.72)",
      "icons": "rgba(37, 193, 171, 0.91)",
      "ntp_background": "rgba(53, 75, 75, 0.91)",
      "ntp_text": "rgba(24, 69, 69, 0.91)",
      "popup_border": "rgba(27, 64, 64, 0.31)",
      "popup_highlight_text": "rgb(48, 103, 113)",
      "popup_highlight": "rgba(53, 57, 57, 0.54)",
      "sidebar_border": "rgb(67, 194, 218)",
      "sidebar_highlight_text": "rgba(13, 42, 21, 0.9)",
      "sidebar_highlight": "rgba(24, 21, 68, 0.9)",
      "sidebar_text": "rgba(170, 168, 193, 0.9)",
      "sidebar": "rgb(75, 115, 110)",
      "tab_background_separator": "rgb(171, 193, 220)",
      "tab_loading": "rgba(56, 201, 196, 0.63)",
      "tab_selected": "rgb(38, 72, 102)",
      "tab_text": "rgba(56, 201, 196, 0.63)",
      "toolbar_bottom_separator": "rgba(14, 20, 20, 0.63)",
      "toolbar_field_border_focus": "rgba(17, 17, 230, 0.33)",
      "toolbar_field_border": "rgba(18, 105, 93, 0.8)",
      "toolbar_field_focus": "rgba(53, 75, 75, 0.91)",
      "toolbar_field_highlight_text": "rgba(169, 205, 205, 0.91)",
      "toolbar_field_highlight": "rgba(14, 20, 20, 0.63)",
      "toolbar_field_separator": "rgba(24, 69, 69, 0.91)",
      "toolbar_field_text_focus": "rgba(16, 9, 37, 0.48)",
      "toolbar_top_separator": "rgb(38, 72, 102)",
      "toolbar_vertical_separator": "rgba(97, 148, 194, 0.72)"
    }
  }
}