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USN-4599-3: Firefox regressions

5 November 2020

USN-4599-1 and USN-4599-2 caused some minor regressions in Firefox.



  • firefox - Mozilla Open Source web browser


USN-4599-1 and USN-4599-2 fixed vulnerabilities in Firefox. The updates
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, spoof the prompt
for opening an external application, obtain sensitive information, or execute
arbitrary code.

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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