context: function showDownload(aDownload){  var f = getLocalFileFromNativePathOrUrl(aDownload.getAttribute("file"));  try {    f.reveal();  } catch (ex) {    // if reveal failed for some reason (eg on unix it's not currently    // implemented), send the file: URL window rooted at the parent to     // the OS handler for that protocol    var parent = f.parent;    if (parent)      openExternal(parent);  }}
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