Examine source code of Squirrelsong Light

{
  "manifest_version": 2,
  "version": "1.2.1",
  "name": "Squirrelsong Light",
  "theme": {
    "images": {},
    "properties": {
      "color_scheme": "light",
      "content_color_scheme": "light"
    },
    "colors": {
      "bookmark_text": "rgb(76, 75, 78)",
      "button_background_active": "rgb(232, 229, 235)",
      "button_background_hover": "rgb(232, 229, 235)",
      "frame_inactive": "rgb(232, 229, 235)",
      "frame": "rgb(232, 229, 235)",
      "icons_attention": "rgb(76, 75, 78)",
      "icons": "rgb(140, 135, 146)",
      "ntp_background": "rgb(253, 253, 254)",
      "ntp_card_background": "rgb(247, 246, 249)",
      "ntp_text": "rgb(120, 115, 125)",
      "popup_border": "rgb(201, 196, 207)",
      "popup_highlight_text": "rgb(76, 75, 78)",
      "popup_highlight": "rgb(219, 215, 224)",
      "popup_text": "rgb(120, 115, 125)",
      "popup": "rgb(247, 246, 249)",
      "sidebar_border": "rgb(201, 196, 207)",
      "sidebar_highlight_text": "rgb(76, 75, 78)",
      "sidebar_highlight": "rgb(219, 215, 224)",
      "sidebar_text": "rgb(120, 115, 125)",
      "sidebar": "rgb(247, 246, 249)",
      "tab_background_text": "rgb(76, 75, 78)",
      "tab_line": "rgb(232, 229, 235)",
      "tab_loading": "rgb(76, 75, 78)",
      "tab_selected": "rgb(247, 246, 249)",
      "tab_text": "rgb(76, 75, 78)",
      "toolbar_bottom_separator": "rgb(201, 196, 207)",
      "toolbar_field_border_focus": "rgb(120, 115, 125)",
      "toolbar_field_border": "rgb(201, 196, 207)",
      "toolbar_field_focus": "rgb(253, 253, 254)",
      "toolbar_field_highlight_text": "rgb(76, 75, 78)",
      "toolbar_field_highlight": "rgb(232, 229, 235)",
      "toolbar_field_text_focus": "rgb(76, 75, 78)",
      "toolbar_field_text": "rgb(76, 75, 78)",
      "toolbar_field": "rgb(253, 253, 254)",
      "toolbar_text": "rgb(140, 135, 146)",
      "toolbar_top_separator": "rgb(201, 196, 207)",
      "toolbar_vertical_separator": "rgb(201, 196, 207)",
      "toolbar": "rgb(247, 246, 249)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{75eff860-d366-4dbe-8625-f30fc12fe0e8}"
    }
  }
}