It looks like the deb that was downloaded was corrupted.
Please try running the following command in a terminal window, and let us know 
if the issue is gone:

    sudo apt reinstall firefox

** Changed in: firefox (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1920833

Title:
  package firefox 86.0+build3-0ubuntu0.20.04.1 failed to
  install/upgrade: impossibile copiare i dati estratti per
  "./usr/lib/firefox/libxul.so" in "/usr/lib/firefox/libxul.so.dpkg-
  new": fine del file o dello stream inattesa

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