is this a firefox bug?

Question

PROBLEM:

firefox can't open files from a ntfs automounted partition on /media/myhd (neither save downloads to /media/myhd/downloads)

INFO:

DISTRO: Xubuntu 18.04

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FSTAB: UUID=38FEBFFAFEBFAE8E /media/myhd ntfs umask=0000,rw,suid,dev,auto,user,async,exec,allow_other,uid=noob,gid=noob,windows_names 0 0

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myhd has been mounted successly, and noob is the current owner.

I think that issue is caused because firefox is currently in /snap/firefox and snap partition has another file system, or maybe, it is a firefox bug.