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firefox regressions

A security issue affects these releases of Ubuntu and its
derivatives:

* Ubuntu 20.04 LTS
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

USN-4546-1 caused some minor regressions in Firefox.

Software Description

* firefox - Mozilla Open Source web browser

Details

USN-4546-1 fixed vulnerabilities in Firefox. The update introduced
various minor regressions. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Multiple security issues were discovered in Firefox. If a user
were tricked in to opening a specially crafted website, an
attacker could potentially exploit these to cause a denial of
service, conduct cross-site scripting (XSS) attacks, spoof the
site displayed in the download dialog, or execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the
following package versions:

Ubuntu 20.04 LTS
firefox - 81.0.2+build1-0ubuntu0.20.04.1

Ubuntu 18.04 LTS
firefox - 81.0.2+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS
firefox - 81.0.2+build1-0ubuntu0.16.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart Firefox to make
all the necessary changes.

References

* USN-4546-1
* LP: 1900032

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