I likewise encountered this problem after upgrading from Ubuntu 16.04 to 18.04. Duplex printing works fine from other applications. I currently have Firefox 62.0.3 installed.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1736680 Title: fixefox duplex printing fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1736680/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
