Execute external file from XPI (Example: Executing Skype with callTo Mode)

var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
var process = Components.classes["@mozilla.org/process/util;1"].createInstance(Components.interfaces.nsIProcess);
var wrk = Components.classes["@mozilla.org/windows-registry-key;1"].createInstance(Components.interfaces.nsIWindowsRegKey);
wrk.open(wrk.ROOT_KEY_LOCAL_MACHINE, "SOFTWARE\\Skype\\Phone", wrk.ACCESS_READ);
var SkypeEXEPath = wrk.readStringValue("SkypePath");
wrk.close();
file.initWithPath(SkypeEXEPath);
process.init(file);
var args = ["/callto:+91-0000000000"];
process.run(false, args, args.length);