! Release Date
! Links
|-
| SeaMonkey 2.18
| May 15
| [http://www.seamonkey-project.org/releases/seamonkey2.18/changes Release Notes]
|-
| Firefox 21.0
| [https://www.mozilla.org/en-US/firefox/21.0/releasenotes/ Release Notes]
|-
| Firefox 17.0.6esr
| May 14
| [https://www.mozilla.org/en-US/firefox/17.0.6/releasenotes/ Release Notes]
|-
| Firefox 21.0 for Android
| May 14
| [https://www.mozilla.org/en-US/mobile/21.0/releasenotes/ Release Notes]
|-
| Thunderbird 17.0.6
| May 14
| [https://www.mozilla.org/en-US/thunderbird/17.0.6/releasenotes/ Release Notes]
|-
| Thunderbird 17.0.6esr
| May 14
| [https://www.mozilla.org/en-US/thunderbird/17.0.6esr/releasenotes/ Release Notes]
|-
| SeaMonkey 2.17.1