To add new site, enter a unique title/domain (without www.) and select options for googlebot/block javascript (block on (sub)domain of site and/or external domains). Then enable your new site in options (cookies will be removed by default).

List of custom sites

Disable deleted sites in options.

Json file

You can edit/sort the text area and save (only when json-text is valid). Clear & save to reset. You can also export/import json-text for new installations.