ction persistVisibleWebSocketsColumns(state) {
  const visibleColumns = [];
  const { columns } = state.messages;
  for (const column in columns) {
    if (columns[column]) {
      visibleColumns.push(column);
    }
  }

  Services.prefs.setCharPref(
    "devtools.netmonitor.msg.visibleColumns",
    JSON.stringify(visibleColumns)
  );
}

/**
 * Store columns data (width, min-width, etc.) into preferences.
 */
function persistColumnsData(state) {
  const columnsData = [...state.ui.columnsData.values()];
  Services.prefs.setCharPref(
    "devtools.netmonitor.columnsData",
    JSON.stringify(columnsData)
  );
}

module.exports = prefsMiddleware;
PK