Ubuntu Brings Thunderbird 91 to Older Releases to Fix Security Flaw - OMG! Ubuntu!
https://www.omgubuntu.co.uk/2021/11/thunderbird-91-backport-ubuntu-18-04-20-04-lts
https://www.omgubuntu.co.uk/2021/11/thunderbird-91-backport-ubuntu-18-04-20-04-lts
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Ubuntu Brings Thunderbird 91 to Older Releases to Fix Security Flaw
Thunderbird 91 is being back-ported to Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. A security vulnerability affecting the Thunderbird 78.x series both builds