Examine source code of white&black-simple

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "white&black-simple",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(233, 233, 233)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(233, 233, 233)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(233, 233, 233)",
      "tab_line": "rgb(233, 233, 233)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(233, 233, 233)",
      "button_background_active": "rgb(233, 233, 233)",
      "button_background_hover": "rgb(20, 20, 20)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(233, 233, 233)",
      "icons": "rgb(233, 233, 233)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_border": "rgb(233, 233, 233)",
      "popup_highlight_text": "rgb(233, 233, 233)",
      "popup_highlight": "rgb(233, 233, 233)",
      "sidebar_border": "rgb(233, 233, 233)",
      "sidebar_highlight_text": "rgb(233, 233, 233)",
      "sidebar_highlight": "rgb(233, 233, 233)",
      "sidebar_text": "rgb(233, 233, 233)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(0, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_highlight": "rgba(233, 233, 233, 0.46)",
      "toolbar_field_separator": "rgba(255, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{70ef2061-79f3-43ea-8efc-592f98381540}"
    }
  }
}