Sometimes when there is a new release of IRBCAM, a hard refresh of your web browser is needed. See for example the following link:
https://www.howtogeek.com/672607/how-to-hard-refresh-your-web-browser-to-bypass-your-cache
If CTRL+F5 doesn’t work in Firefox, you can also try CTRL+SHIFT+DELETE and delete the “Cache” and “Offline website data”.
Finally, close your web browser and restart.