File "/tmp/.mount_electr8qQVF8/usr/lib/python3.7/site-packages/electrum/gui/qt/main_window.py", line 721, in <lambda>
    tab.menu_action = view_menu.addAction(item_name, lambda: self.toggle_tab(tab))
  File "/tmp/.mount_electr8qQVF8/usr/lib/python3.7/site-packages/electrum/gui/qt/main_window.py", line 344, in toggle_tab
    self.config.set_key('show_{}_tab'.format(tab.tab_name), show)
  File "/tmp/.mount_electr8qQVF8/usr/lib/python3.7/site-packages/electrum/simple_config.py", line 160, in set_key
    self._set_key_in_user_config(key, value, save)
  File "/tmp/.mount_electr8qQVF8/usr/lib/python3.7/site-packages/electrum/simple_config.py", line 169, in _set_key_in_user_config
    self.save_user_config()
  File "/tmp/.mount_electr8qQVF8/usr/lib/python3.7/site-packages/electrum/simple_config.py", line 262, in save_user_config
    f.write(s)