Public bug reported:

When testing firefox 80.0+build2 on xenial (from
/~ubuntu-mozilla-security/+archive/ubuntu/ppa/+packages), I'm observing
that the flash plugin (installed by flashplugin-installer) doesn't work.
This appears to affect only xenial, flash is working in the bionic and
focal builds.

This is what I'm seeing when launching firefox from a terminal:

  /usr/lib/firefox/plugin-container: symbol lookup error:
/usr/lib/firefox/ undefined symbol: gtk_window_set_titlebar

This is most likely caused by this recent upstream change:

** Affects: firefox (Ubuntu)
     Importance: High
     Assignee: Olivier Tilloy (osomon)
         Status: Triaged

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  Flash plugin symbol lookup error with firefox 80.0+build2 on xenial

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