Anonymous

// get profile directoryvar file = Components.classes["@mozilla.org/file/directory_service;1"]                     .getService(Components.interfaces.nsIProperties)                     .get("ProfD", Components.interfaces.nsIFile);file.append("test.txt");// |file| is nsIFilevar data = "";var fstream = Components.classes["@mozilla.org/network/file-input-stream;1"]                        .createInstance(Components.interfaces.nsIFileInputStream);var sstream = Components.classes["@mozilla.org/scriptableinputstream;1"]                        .createInstance(Components.interfaces.nsIScriptableInputStream);fstream.init(file, -1, 0, 0);sstream.init(fstream); var str = sstream.read(4096);while (str.length > 0) {  data += str;  str = sstream.read(4096);}sstream.close();fstream.close();alert(data);