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The support for encrypting via subkeys has been improved.
The update fixes a bug in the tracking protection of Firefox 81.0.1.
The update fixes a security vulnerability classified as critical.
Developers are further optimizing the OpenPGP encryption.
The update fixes several problems in Firefox 81.0.
The security update for the PDF viewer fixes 13 vulnerabilities.
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The developers have fixed five security vulnerabilities.
This update for Firefox 80.x solves some problems of the previous version.