! Date
! Notes
|-
| SeaMonkey 2.29
| September 7
| [http://www.seamonkey-project.org/releases/seamonkey2.29/ Release Notes]
|-
| Thunderbird 31.1.0
| September 2
| [https://www.mozilla.org/en-US/thunderbird/31.1.0/releasenotes/ Release Notes]
|-
| Thunderbird 24.7.0
| September 2
| [https://www.mozilla.org/en-US/thunderbird/24.8.0/releasenotes/ Release Notes]
|-
| Firefox 31.0