Glad to read that the problem is gone. Thanks for following up, and
don't hesitate to re-open the bug if it happens again.
** Changed in: firefox (Ubuntu)
Status: New => Invalid
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After another update today (30Apr2020) and another run of update-manager
the problem appears to be gone.
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https://bugs.launchpad.net/bugs/1875835
Title:
Firefox fails to start - says
Adding apparmor log
** Attachment added: "Apparmor messages"
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1875835/+attachment/5363318/+files/apparmor.log
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