Thanks for reporting, but this is not a bug.
To solve your problem, just open terminal (Applications→Accesories→Terminal)
and use command 'sudo dpkg --configure -a'
** Changed in: firefox (Ubuntu)
Status: New => Invalid
** bug changed to question:
https://answers.edge.launchpad.net/ubuntu/+source/firefox/+question/28516
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error in update manager
https://bugs.launchpad.net/bugs/185003
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