Mozilla fixes security vulnerabilities in Thunderbird 78.9.1

Hello everyone,

Mozilla has fixed few security vulnerabilities in Thunderbird 78.9.1. These vulnerabilities are 'Moderate' in severity. The details of the vulnerabilities fixed are as follows:

CVE ID	Vulnerability	Severity
CVE-2021-23991	An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key	Moderate
MOZ-2021-23992	A crafted OpenPGP key with an invalid user ID could be used to confuse the user	Moderate
CVE-2021- 23993	Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key	Moderate

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