File "/usr/lib/python3.6/site-packages/electrum_gui/qt/history_list.py", line 349, in <lambda>
    menu.addAction(_("View on block explorer"), lambda: webbrowser.open(tx_URL))
  File "/usr/lib/python3.6/webbrowser.py", line 60, in open
    if browser.open(url, new, autoraise):
  File "/usr/lib/python3.6/webbrowser.py", line 238, in open
    success = self._invoke(args, True, autoraise)
  File "/usr/lib/python3.6/webbrowser.py", line 203, in _invoke
    stderr=inout, start_new_session=True)
  File "/usr/lib/python3.6/subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1344, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)