def _install_ff_locally(self, path, ff_exe):

        if sys.platform.startswith('win'):
            # Windows: copy the whole tuntime
            copy_xul_runtime(op.dirname(ff_exe), path)
        else:
            # OSX / Linux: create a symlink to xul runtime exe
            os.mkdir(path)
            stub_exe = op.join(path, 'xulrunner')
            os.symlink(ff_exe, stub_exe)
            return stub_exe
Make a local "copy" of the firefox runtime. This should put
dataset/ETHPy150Open zoofIO/flexx/flexx/webruntime/xul.py/XulRuntime._install_ff_locally