According to Adobe's website, support for Flash will be dropped this year (2020). They advise any business or website that is currently using Flash to migrate over to a more universal platform, such as HTML5.
xat's HTML5 version of the chat and website are currently under development. To visit the HTML5 chatboxes, add "?new" after a chat name. For example, "xath.hu/Ajutor?new".
To report an issue or bug:
Official testing chat:
This article highlights various information relating to the changes, features, major improvements and powers surrounding HTML5.