MGASA-2019-0285 Updated thunderbird packages fix security vulnerabilities

The updated thunderbird packages fix security issues: Covert Content Attack on S/MIME encryption using a crafted multipart/ alternative message. CVE-2019-11739 Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, Firefox ESR 60.9, Thunderbird 68.1, and Thunderbird 60.9. CVE-2019-11740...