Examine source code of Dark Uniform V2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Uniform V2",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgba(41, 49, 52, 0.8)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 23, 23)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(77, 144, 162, 0.6)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(19, 19, 19)",
      "popup": "rgb(47, 46, 51)",
      "popup_text": "rgb(238, 238, 238)",
      "button_background_active": "rgb(58, 93, 102)",
      "button_background_hover": "rgba(77, 144, 162, 0.8)",
      "frame_inactive": "rgb(34, 25, 77)",
      "icons_attention": "rgb(237, 214, 60)",
      "icons": "rgb(193, 214, 230)",
      "ntp_background": "rgb(91, 91, 104)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(77, 144, 162)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(77, 144, 162)",
      "sidebar_border": "rgb(40, 40, 45)",
      "sidebar_highlight": "rgb(59, 108, 120)",
      "sidebar": "rgb(40, 40, 45)",
      "tab_loading": "rgba(59, 75, 89, 0.82)",
      "tab_selected": "rgba(41, 49, 52, 0.6)",
      "tab_text": "rgb(237, 189, 60)",
      "toolbar_bottom_separator": "rgb(41, 49, 52)",
      "toolbar_field_border_focus": "rgb(78, 77, 90)",
      "toolbar_field_border": "rgb(77, 144, 162)",
      "toolbar_field_focus": "rgba(43, 67, 72, 0.9)",
      "toolbar_field_highlight": "rgb(31, 51, 56)",
      "toolbar_field_separator": "rgb(149, 201, 215)",
      "toolbar_top_separator": "rgb(41, 49, 52)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{34d3ded5-d8e5-420a-bc5c-09f905008239}"
    }
  }
}