OAuth 2.0 authorisation doesn't work

[anonymous]

When pressing "Authorise now (Fully automatic)" in OSM Server preferences, I get redirected to OSM authorisation page and press "Authorise", but nothing happens. No error messages.

Fedora with GNOME on Wayland

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2026-02-04 14:05:13 +0100 (Wed, 04 Feb 2026)
Revision:19486
Build-Date:2026-02-05 02:30:42
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19486 en_GB) Linux Fedora Linux 43 (Workstation Edition)
Memory Usage: 344 MB / 1954 MB (210 MB allocated, but free)
Java version: 25.0.1+8, Red Hat, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.gtk.GTKLookAndFeel
Screen: :0.0 1920x1080x[Multi depth]@60Hz (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_GB.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_GB
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: GNOME
Java package: java-25-openjdk:x86_64-25.0.1.0.8
VM arguments: [--add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]

Map paint styles:
- https://raw.githubusercontent.com/Maerek/Better-iD/refs/heads/main/better-id.mapcss

Last errors/warnings:
- 00001.195 W: Missing plugin main version in plugin panoramax
- 00002.005 W: Missing plugin main version in plugin panoramax

[anonymous]

Apparently the issue was my hardened firefox' enhanced security features that prevented the browser to communicate with JOSM properly (as it seems). Got it to work with normal firefox. Closing as "works for me", but there should be an error message for this.