Firefox Permission Denied Errors in Ubuntu 22.04

[spflanze]

The OS is Ubuntu 22.04. This OS installation is highly customized. It has a ZFS encrypted file system, and RAID. The details, if you wish to see them, can be downloaded here:

https://www.mediafire.com/file/2w8mdb96tbzslub/Ubuntu_22.04_Root_on_ZFS_Encryption.odt/file

The problem I have now is when firefox is launched from the Konsole terminal emulator there are many permission denied errors. These are pasted below. Although firefox does run, and I am able to browse the web with it, these are not errors that can be ignored. Obviously firefox does not have needed permissions. What permissions does it need? How are they normally obtained? What should be done about them?

The errors:

$ firefox
2022/07/19 17:59:48.273436 cmd_run.go:1053: WARNING: cannot start document portal: Expected portal at "/run/user/1000/doc", got "/home/stephen/.cache/doc"
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/gtk-doc /usr/share/gtk-doc none bind,ro 0 0): cannot open directory "/var/lib": permission denied
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/libreoffice/help /usr/share/libreoffice/help none bind,ro 0 0): cannot create directory "/usr/share/libreoffice/help": permission denied
update.go:85: cannot change mount namespace according to change mount (/var/lib/snapd/hostfs/usr/share/xubuntu-docs /usr/share/xubuntu-docs none bind,ro 0 0): cannot open directory "/var/lib": permission denied
mkdir: cannot create directory '/run/user/1000': Permission denied
Gtk-Message: 18:00:12.253: Failed to load module "colorreload-gtk-module"
Gtk-Message: 18:00:12.253: Failed to load module "window-decorations-gtk-module"
ATTENTION: default value of option mesa_glthread overridden by environment.
ATTENTION: default value of option mesa_glthread overridden by environment.

(firefox:16099): dconf-CRITICAL **: 18:00:13.676: unable to create directory '/run/user/1000/snap.firefox/dconf': Permission denied.  dconf will not work properly.

(firefox:16099): dconf-WARNING **: 18:00:13.676: unable to open file '/etc/dconf/db/site': Failed to open file ?/etc/dconf/db/site?: open() failed: No such file or directory; expect degraded performance

(firefox:16099): dconf-CRITICAL **: 18:00:13.676: unable to create directory '/run/user/1000/snap.firefox/dconf': Permission denied.  dconf will not work properly.

[spflanze]

These problems are solved. How they were solved I described in this thread:
http://forums.mozillazine.org/viewtopic.php?f=38&t=3097766

My installation document I linked to when I opened this thread has been updated at the link provided.