! Date
! Notes
|-
| SeaMonkey 2.31
| December 9
| [http://www.seamonkey-project.org/releases/seamonkey2.31/ Release Notes]
|-
| Thunderbird 31.3.0
| December 1
| [https://www.mozilla.org/en-US/thunderbird/31.3.0/releasenotes/ Release Notes]
|-
| Firefox 33.1