To add a new site, enter an unique title/domain (without www.) and select options for Googlebot/block Javascript (block on (sub)domain(s) of site and/or external domains).
Custom sites are enabled automatically in (cookies will be removed by default unless you enable allow_cookies).
If you want to use custom sites (for non-listed sites) enable it in Custom sites enabled:
List of custom sites
* already in default list (double domain)
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.