@import url("chrome://browser/skin/browser-common.css");

@media not all and (-moz-os-version: windows-xp) { /* Not Windows XP and not Classic theme */
	@media not all and (-moz-windows-classic) {
		#context-back[_moz-menuactive=true],
		#context-forward[_moz-menuactive=true],
		#context-reload[_moz-menuactive=true],
		#context-stop[_moz-menuactive=true],
		#context-bookmarkpage[_moz-menuactive=true] {
		  list-style-image: url("chrome://browser/skin/Toolbar.png"); /* remain black */
		}
	}
}

@import url("chrome://browser/skin/browser-common.css");

@media not all and (-moz-os-version: windows-xp) { /* Not Windows XP and not Classic theme */
  @media not all and (-moz-windows-classic) {
    #context-back[_moz-menuactive=true],
    #context-forward[_moz-menuactive=true],
    #context-reload[_moz-menuactive=true],
    #context-stop[_moz-menuactive=true],
    #context-bookmarkpage[_moz-menuactive=true] {
      list-style-image: url("chrome://browser/skin/Toolbar.png"); /* remain black */
    }

    #context-navigation {
      background-color: -moz-dialog;
    }
  }
}

Improve context menu background in Windows
Improve context menu background in Windows
