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Security fixes can be found here
Importing an RSA private key fails if p < q (see bug 1049435)
Invalid certificate issue with mozilla::pkix (see bug 1042889)
Fixed a case where having a contact and card in an address book with the same name could send to the mailing list (Bug 1008718)
Users of jp mac builds may have issues with no mail folders being displayed in the main window. Running Thunderbird in 32-bit mode temporarily will workaround this issue.
Installing extensions within Thunderbird requires download and installing as a file (bug 1081190)