[Support] Firefox 115.8.0 ESR is failing Cloudfare's captcha - eviltoast

Hello. For a couple of days my browser has been failing automated captchas when it is hosted by Cloudfare. Any other captcha service works well and lets me go trough.

This is happening on Firefox for Debian Linux 12 (apt). Doesn’t happen on Firefox flatpak and Chromium apt.

What can I do to check further or to give more info?