Examine source code of Darker Moss

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Darker Moss",
  "theme": {
    "colors": {
      "toolbar": "rgb(30, 28, 31)",
      "toolbar_text": "rgb(224, 222, 225)",
      "frame": "rgb(17, 15, 18)",
      "tab_background_text": "rgb(224, 222, 225)",
      "toolbar_field": "rgb(30, 28, 31)",
      "toolbar_field_text": "rgb(224, 222, 225)",
      "tab_line": "rgb(92, 124, 116)",
      "popup": "rgb(30, 28, 31)",
      "popup_text": "rgb(224, 222, 225)",
      "button_background_active": "rgb(108, 106, 109)",
      "frame_inactive": "rgb(17, 15, 18)",
      "icons_attention": "rgb(92, 124, 116)",
      "icons": "rgb(224, 222, 225)",
      "ntp_background": "rgb(17, 15, 18)",
      "ntp_text": "rgb(224, 222, 225)",
      "popup_border": "rgba(224, 222, 225, 0.33)",
      "popup_highlight_text": "rgb(224, 222, 225)",
      "popup_highlight": "rgb(108, 106, 109)",
      "sidebar_border": "rgb(30, 28, 31)",
      "sidebar_highlight_text": "rgb(17, 15, 18)",
      "sidebar_highlight": "rgb(92, 124, 116)",
      "sidebar_text": "rgb(224, 222, 225)",
      "sidebar": "rgb(30, 28, 31)",
      "tab_background_separator": "rgb(92, 124, 116)",
      "tab_loading": "rgb(92, 124, 116)",
      "tab_selected": "rgb(92, 124, 116)",
      "tab_text": "rgb(17, 15, 18)",
      "toolbar_bottom_separator": "rgb(30, 28, 31)",
      "toolbar_field_border_focus": "rgb(92, 124, 116)",
      "toolbar_field_border": "rgb(30, 28, 31)",
      "toolbar_field_focus": "rgb(30, 28, 31)",
      "toolbar_field_highlight_text": "rgb(30, 28, 31)",
      "toolbar_field_highlight": "rgb(92, 124, 116)",
      "toolbar_field_separator": "rgb(92, 124, 116)",
      "toolbar_vertical_separator": "rgba(224, 222, 225, 0.33)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0fae10b3-1a58-407b-a16a-20c2c1845d4f}"
    }
  }
}