If you press the backspace key twice while co-browsing in Firefox, the co-browse window will close. This is expected behavior in Firefox as the backspace is a shortcut key for the back button when pressed multiple times. (Prior to version 87 of Firefox, even a single backspace press would do this.
If you use Firefox, please keep this behavior in mind to avoid accidental termination of co-browse.
Note: We support only Chrome and Edge browsers on the agent side. (Learn more.)
If you have accidentally closed co-browse in this way, you need to start over by re-inviting the visitor.