Description of problem:

Firefox when initiated over ssh -X remote access initiates fusermount process, this process is not terminated on closing session.

After initiating firefox a '/usr/libexec/xdg-document-portal' process is initiated which initiates fusermount process, similar to following : 

fusermount -o rw,nosuid,nodev,fsname=portal,auto_unmount,subtype=portal – /run/user/27193/doc

This keeps running even when ssh session is closed.

Version-Release number of selected component (if applicable):

firefox-115.8.0-1.el8_9

RHEL 8.9

How reproducible: Always

Steps to Reproduce:

1. Connect remotely to the system via ssh -X
2. Initiate firefox over remote ssh -X access.
3. Observe that '/usr/libexec/xdg-document-portal' process is initiated which initiates fusermount process, similar to following : 

fusermount -o rw,nosuid,nodev,fsname=portal,auto_unmount,subtype=portal – /run/user/27193/doc

       4. Stop firefox and end ssh session, yet fusermount process does not stop running.

Actual results : 

fusermount process, along with its mount, /run/user/<userid>/doc remains active. This occasionally results in the fusermount process becoming defunct.

Expected result: fusermount process should stop.