Examine source code of B&W NIGHT

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "B&W NIGHT",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(48, 47, 47)",
      "toolbar_text": "rgba(255, 255, 255, 0.88)",
      "frame": "rgb(48, 47, 47)",
      "tab_background_text": "rgb(220, 220, 220)",
      "toolbar_field": "rgba(200, 200, 200, 0.82)",
      "toolbar_field_text": "rgb(42, 42, 42)",
      "tab_line": "rgba(0, 0, 0, 0.65)",
      "popup": "rgba(200, 200, 200, 0.75)",
      "popup_text": "rgb(42, 42, 42)",
      "frame_inactive": "rgb(42, 42, 42)",
      "popup_border": "rgba(200, 200, 200, 0.27)",
      "popup_highlight_text": "rgba(255, 255, 255, 0.9)",
      "tab_background_separator": "rgb(42, 42, 42)",
      "tab_selected": "rgba(109, 109, 109, 0.72)",
      "toolbar_bottom_separator": "rgba(48, 47, 47, 0.38)",
      "toolbar_field_border_focus": "rgb(42, 42, 42)",
      "toolbar_field_border": "rgb(42, 42, 42)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.9)",
      "toolbar_field_highlight": "rgb(42, 42, 42)",
      "toolbar_field_separator": "rgb(42, 42, 42)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(48, 47, 47, 0.66)",
      "tab_loading": "rgba(0, 0, 0, 0.65)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{71bf38bd-bc95-45c1-93f8-b52b2fc4e6f6}"
    }
  }
}