Class, the developers of Collaborate, have announced that "Firefox support will be deprecated in phases across Class Collaborate ...Due to a known performance issue affecting Mozilla Firefox users in Class Collaborate".
The 'known issue' article from Class can be read here: https://support.class.com/s/article/Known-Issue-Performance-Issues-for-Firefox-users-in-Class-Collaborate. Currently, Firefox users will be presented with a message about this deprecation of service. Class can be contacted at collaborate@class.com if you require further information on this development.
