New themes wont load on libreoffice 6 (linux mint)

When I click on Tools/Option/LibreOffice/Personalization then change to Pre-installed Theme, a window appears to type a “Search term or Firefox Theme URL”, and nothing happens but a “Cannot open…” error when trying a URL.

This seems to be a common error at present, and so I’m wondering if there is a fix for that yet.

Thank you

Please see Bug 118881 - Personas not found again

You may also want to check in Bugzilla as there have been various bugs in this area.