I tried su - rather than plain su and it did open gedit although it still gave me:
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[root@localhost ~]# gedit
** (gedit:7392): WARNING **: Can't load fallback CSS resource: Failed to import: The resource at '/org/gnome/adwaita/gtk-fallback.css' does not exist
** (gedit:7392): WARNING **: Can't load fallback CSS resource: Failed to import: The resource at '/org/gnome/adwaita/gtk-fallback.css' does not exist
** (gedit:7392): WARNING **: Could not load theme icon user-bookmarks-symbolic: Icon 'user-bookmarks-symbolic' not present in theme
** (gedit:7392): WARNING **: Could not load theme icon user-home-symbolic: Icon 'user-home-symbolic' not present in theme
** (gedit:7392): WARNING **: Could not load theme icon drive-harddisk-symbolic: Icon 'drive-harddisk-symbolic' not present in theme
But I do know now how to open gedit as root, thanks.
By PM, I meant Partition Manager and as I said, it told me why my fstab entries had failed. I was trying fstab entries to mount under /media, /run/media, or /mnt (I think) and they were not working. When I tried to enter these same mount points in PM, it specifically told me they wouldn't work because I was trying to mount a FAT partition in a True File System, ext4. /mnt/windows/thunderbird and /mnt/windows/mozilla worked for the loacations where I have the xx.default files for TB and FF. I'd never needed the /mnt/windows mount point before.