Mozilla released the next scheduled update for the Thunderbird 31 branch on Tuesday, October 14th with Thunderbird 31.2.0. This release addressed these issues:
- Bug 1008718: Fixed a case where having a contact and card in an address book with the same name could send to the mailing list
- Security fixes can be found here
Users may be prompted to update to the newest release of Thunderbird or can do so manually within Thunderbird by going to Help > About Thunderbird and following the update prompts. Users may also manually download and install the Thunderbird update via the getthunderbird.com site.
The next scheduled update for the Thunderbird 31 branch is November 25th with Thunderbird 31.3.0.