Firefox 91 emits error "Unknown paper size"

Solution In Progress - Updated -

Issue

If a $HOME/.cups/lpoptions file exists, Firefox 91 shows the following error:

(firefox:16955): Gtk-WARNING **: 09:16:28.873: Unknown paper size

Also, Firefox uses A5 as paper size when printing, even if the printer is configured for A4, and each user must manually change the paper size before printing.

Environment

  • Red Hat Enterprise Linux (RHEL) 8.5
  • Firefox 91

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