Renders mouse cursor wrong on Firefox
Author: jepstCreated Jul 8, 2026Updated Aug 16, 2026
Describe the bug The mouse cursor in NoVNC is rendered as a square, rather than as a typical arrow-shaped cursor as expected.
To reproduce Steps to reproduce the behavior: Use NoVNC to connect to an x11vnc host. The cursor will be rendered as a noisy square. This happens only on Firefox; confirmed not a bug in Chrome/Chromium.
Expected behavior I expected to see an arrow-shaped cursor, or some other cursor specified by the configuration of the X11 application.
Screenshots If applicable, add screenshots to help explain your problem.
Client (please complete the following information):
- OS: tested on Debian Trixie
- Browser: Firefox
- Browser version: 140.12.0esr
Server (please complete the following information):
- noVNC version: 1.4.0
- VNC server: x11vnc
- WebSocket proxy: websockify
Source: novnc/noVNC