# SeaMonkey

SeaMonkey is a free and open-source Internet suite. It is the continuation of the former Mozilla Application Suite, based on the same source code, which itself grew out of Netscape Communicator and formed the base of Netscape 6 and Netscape 7.
SeaMonkey was created in 2005 after the Mozilla Foundation decided to focus on the standalone projects Firefox and Thunderbird. The development of SeaMonkey is community-driven, in contrast to the Mozilla Application Suite, which until its last released version (1.7.13) was governed by the Mozilla Foundation. The new project-leading group is called the SeaMonkey Council.
Compared to Firefox, the SeaMonkey web browser keeps the more traditional-looking interface of Netscape and the Mozilla Application Suite. It also retains the legacy XPCOM-based add-on system which allows the user to extend SeaMonkey by modifying add-ons for Thunderbird or the add-ons that were formerly compatible with Firefox before the latter switched to WebExtensions.

## Components

SeaMonkey consists of a web browser (which is a descendant of the Netscape family), an email and news client program (SeaMonkey Mail & Newsgroups, which shares code with Mozilla Thunderbird), an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla). The software suite supports skins. It comes with two skins in the default installation, Modern and Classic.

### Mail

SeaMonkey Mail is a traditional e-mail client that includes support for multiple accounts, junk mail detection, message filters, HTML message support, and address books, among other features such as a calendar. It shares code with Mozilla Thunderbird; both Thunderbird and SeaMonkey are built from Mozilla's comm-central source tree.

### Composer

SeaMonkey Composer is a WYSIWYG HTML editor descended from Mozilla Composer. Its main user interface features four tabs: Normal (WYSIWYG), HTML tags, HTML code, and browser preview. The generated code is HTML 4.01 Transitional.

## Naming

To avoid confusing organizations that still want to use the original Mozilla Application Suite, the new product needed a new name. After initial speculation by members of the community, a July 2, 2005 announcement confirmed that SeaMonkey would officially become the name of the Internet suite superseding the Mozilla Application Suite.
"Seamonkey" (with a lowercase "m") refers to brine shrimp and had been used by Netscape and the Mozilla Foundation as a code name for the never-released Netscape Communicator 5 and later the Mozilla Application Suite itself. Originally, the name "Seamonkey" was derived by Netscape management to replace "Buttmonkey", which their developers had chosen following an internal contest for the codename.
The SeaMonkey Council has now trademarked the name with help from the Mozilla Foundation. The project uses a separate numbering scheme, with the first release being called SeaMonkey 1.0. Despite having a different name and version number, SeaMonkey 1.0 is based on the same code as Mozilla Application Suite 1.7.
For trademark and copyright reasons, Debian rebranded SeaMonkey and distributed it as Iceape until 2013.

## History

On March 10, 2005, the Mozilla Foundation announced that it would not release any official versions of Mozilla Application Suite beyond 1.7.x, since it had now focused on the standalone applications Firefox and Thunderbird. However, the Foundation emphasized that it would still provide infrastructure for community members who wished to continue development. In effect, this meant that the suite would still continue to be developed, but now by the SeaMonkey Council instead of the Mozilla Foundation.
SeaMonkey was first released on September 15, 2005. SeaMonkey 1 was released on January 30, 2006.
Core Mozilla project source code was licensed under a disjunctive tri-license (before changing to MPL 2.0) that gave the choice of one of the three following sets of licensing terms: Mozilla Public License, version 1.1 or later, GNU General Public License, version 2.0 or later, GNU Lesser General Public License, version 2.1 or later.

## Release history

Parts of this table are based on the SeaMonkey release notes, and status meetings.
* Old release
* Current release
* Current test release
Release history :
| Gecko branch | Version | Release date | Significant changes |
| 1.8 | 1.0 alpha | September 15, 2005 | |
| 1.8 | 1.0 beta | December 19, 2005 | SVG graphics support enabled by default. |
| 1.8.0 | 1.0 | January 30, 2006 | Official version 1.0 release. |
| 1.8.0 | 1.0.1 | April 13, 2006 | Security updates and native support for Intel-based Macintosh computers, via Universal Binary. |
| 1.8.0 | 1.0.2 | June 1, 2006 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.3 | July 27, 2006 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.4 | August 2, 2006 | Small fix for a regression with the Microsoft Media Server protocol in 1.0.3. |
| 1.8.0 | 1.0.5 | September 14, 2006 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.6 | November 8, 2006 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.7 | December 20, 2006 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.8 | February 27, 2007 | Stability improvement and security fixes. |
| 1.8.0 | 1.0.9 | May 30, 2007 | Stability improvement and security fixes. Marks the end of life for SeaMonkey 1.0.x series. |
| 1.8.1 | 1.1 alpha | August 30, 2006 | Major feature work |
| 1.8.1 | 1.1 beta | November 8, 2006 | Major feature work |
| 1.8.1 | 1.1 | January 18, 2007 | Official version 1.1 release. |
| 1.8.1 | 1.1.1 | February 28, 2007 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.2 | May 30, 2007 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.3 | July 19, 2007 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.4 | August 3, 2007 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.5 | October 19, 2007 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.6 | November 5, 2007 | Several small problems in displaying certain web pages corrected |
| 1.8.1 | 1.1.7 | November 30, 2007 | Stability improvement and security fixes. Problem with running SeaMonkey from read-only application directories corrected. The last to be built for Solaris 8. |
| 1.8.1 | 1.1.8 | February 7, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.9 | March 25, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.10 | July 2, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.11 | July 15, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.12 | September 23, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.13 | November 12, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.14 | December 16, 2008 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.15 | March 18, 2009 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.16 | April 8, 2009 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.17 | June 22, 2009 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.18 | September 3, 2009 | Stability improvement and security fixes. |
| 1.8.1 | 1.1.19 | March 16, 2010 | Stability improvement and security fixes. End-of-life of 1.1.x product line. The last to support Windows 98/Me. The last to be built for Solaris 10. |
| 1.9.1 | 2.0 alpha 1 | October 5, 2008 | Toolkit transition and major feature work |
| 1.9.1 | 2.0 alpha 2 | December 10, 2008 | Toolkit transition and major feature work |
| 1.9.1 | 2.0 alpha 3 | March 3, 2009 | Toolkit transition and major feature work |
| 1.9.1 | 2.0 beta 1 | July 21, 2009 | Follows Gecko 1.9.1.1 stable release, major feature work |
| 1.9.1 | 2.0 beta 2 | September 12, 2009 | Major feature work |
| 1.9.1 | 2.0 RC 1 | October 10, 2009 | First release candidate |
| 1.9.1 | 2.0 RC 2 | October 19, 2009 | Second release candidate |
| 1.9.1 | 2.0 | October 27, 2009 | Official version 2.0 release. |
| 1.9.1 | 2.0.1 | December 15, 2009 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.2 | January 11, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.3 | February 17, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.4 | March 30, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.5 | June 22, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.6 | July 20, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.7 | September 7, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.8 | September 15, 2010 | Stability improvements only. |
| 1.9.1 | 2.0.9 | October 20, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.10 | October 28, 2010 | Security fix. |
| 1.9.1 | 2.0.11 | December 9, 2010 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.12 | March 2, 2011 | Security fix. |
| 1.9.1 | 2.0.13 | March 23, 2011 | Stability improvement and security fixes. |
| 1.9.1 | 2.0.14 | April 28, 2011 | Stability improvement and security fixes. This is the last version to support Mac OS X 10.4 Tiger and PowerPC Macs |
| 1.9.3 | 2.1 alpha 1 | May 18, 2010 | Feature work |
| 1.9.3 | 2.1 alpha 2 | July 7, 2010 | New addons manager, Feature work Archived July 12, 2010, at the Wayback Machine |
| 2.0 | 2.1 alpha 3 | August 24, 2010 | Third alpha release |
| 2.0 | 2.1 beta 1 | October 20, 2010 | First beta release |
| 2.0 | 2.1 beta 2 | February 14, 2011 | Second beta release |
| 2.0 | 2.1 beta 3 | April 7, 2011 | Third beta release |
| 2.0 | 2.1 RC 1 | May 12, 2011 | First release candidate |
| 2.0 | 2.1 RC 2 | June 6, 2011 | Second release candidate |
| 2.0 | 2.1 | June 10, 2011 | Official version 2.1 release. The last to be built for OS/2. |
| 5.0 | 2.2 beta 1 | June 22, 2011 | First beta release |
| 5.0 | 2.2 beta 2 | June 28, 2011 | Second beta release |
| 5.0 | 2.2 beta 3 | July 2, 2011 | Third beta release |
| 5.0 | 2.2 | July 7, 2011 | Official version 2.2 release. |
| 6.0 | 2.3 beta 1 | July 25, 2011 | First beta release |
| 6.0 | 2.3 beta 2 | July 31, 2011 | Second beta release |
| 6.0 | 2.3 beta 3 | August 6, 2011 | Third beta release |
| 6.0 | 2.3 | August 16, 2011 | Official version 2.3 release. |
| 6.0 | 2.3.1 | August 23, 2011 | Official version 2.3.1 release. Added a security certificate in order to avoid disabling future automatic software updates. |
| 6.0 | 2.3.2 | August 31, 2011 | Official version 2.3.2 release. Removed root certificate for Diginotar. Many downloads erroneously identify themselves as version 2.3.1. |
| 6.0 | 2.3.3 | September 6, 2011 | Official version 2.3.3 release. Removed trust exceptions for certificates issued by Staat der Nederlanden. Fixed an error with .gov.uk domains. |
| 7.0 | 2.4 beta 1 | September 6/7, 2011 | First beta release |
| 7.0 | 2.4 beta 2 | September 12, 2011 | Second beta release |
| 7.0 | 2.4 beta 3 | September 18, 2011 | Third beta release |
| 7.0 | 2.4 | September 27, 2011 | Official version 2.4 release. |
| 7.0 | 2.4.1 | September 29, 2011 | Official version 2.4.1 release. |
| 8.0 | 2.5 beta 1 | September 30, 2011 | First beta release |
| 8.0 | 2.5 beta 2 | October 7, 2011 | Second beta release |
| 8.0 | 2.5 beta 3 | October 14, 2011 | Third beta release |
| 8.0 | 2.5 beta 4 | November 9, 2011 | Fourth beta release |
| 8.0 | 2.5 | November 22, 2011 | Official version 2.5 release. |
| 9.0 | 2.6 beta 1 | November 23, 2011 | First beta release |
| 9.0 | 2.6 beta 2 | December 3, 2011 | Second beta release |
| 9.0 | 2.6 beta 3 | December 9, 2011 | Third beta release |
| 9.0 | 2.6 beta 4 | December 14, 2011 | Fourth beta release |
| 9.0 | 2.6 | December 20, 2011 | Official version 2.6 release. |
| 9.0 | 2.6.1 | December 22, 2011 | Official version 2.6.1 release. |
| 10.0 | 2.7 beta 1 | December 24, 2011 | First beta release |
| 10.0 | 2.7 beta 2 | December 30, 2011 | Second beta release |
| 10.0 | 2.7 beta 3 | January 7, 2012 | Third beta release. |
| 10.0 | 2.7 beta 4 | January 20, 2012 | Fourth beta release. |
| 10.0 | 2.7 beta 5 | January 26, 2012 | Fifth beta release. |
| 10.0 | 2.7 | January 31, 2012 | Official version 2.7 release. |
| 10.0 | 2.7.1 | February 10, 2012 | Official version 2.7.1 release. |
| 10.0 | 2.7.2 | February 17, 2012 | Official version 2.7.2 release. |
| 11.0 | 2.8 alpha 1 | December 17, 2011 | First alpha release. |
| 11.0 | 2.8 alpha 2 | December 18, 2011 | Second alpha release. |
| 11.0 | 2.8 beta 1 | February 4, 2012 | First beta release. |
| 11.0 | 2.8 beta 2 | February 9, 2012 | Second beta release. |
| 11.0 | 2.8 beta 3 | February 18, 2012 | Third beta release. |
| 11.0 | 2.8 beta 4 | February 25, 2012 | Fourth beta release. |
| 11.0 | 2.8 beta 5 | March 6, 2012 | Fifth beta release. |
| 11.0 | 2.8 beta 6 | March 8, 2012 | Sixth beta release. |
| 11.0 | 2.8 | March 13, 2012 | Official version 2.8 release. |
| 12.0 | 2.9 alpha 1 | January 20, 2012 | First alpha release. |
| 12.0 | 2.9 beta 1 | March 26, 2012 | First beta release. |
| 12.0 | 2.9 beta 2 | March 30, 2012 | Second beta release. |
| 12.0 | 2.9 beta 3 | April 14, 2012 | Third beta release. |
| 12.0 | 2.9 beta 4 | April 19, 2012 | Fourth beta release. |
| 12.0 | 2.9 | April 24, 2012 | Official version 2.9 release. |
| 12.0 | 2.9.1 | April 30, 2012 | Official version 2.9.1 release. This is the last version to support Windows 2000. |
| 13.0 | 2.10 beta 1 | May 12, 2012 | First beta release. |
| 13.0 | 2.10 beta 2 | May 23, 2012 | Second beta release. |
| 13.0 | 2.10 beta 3 | June 1, 2012 | Third beta release. |
| 13.0 | 2.10 | June 6, 2012 | Official version 2.10 release. Introduction of tabs lazy loading. |
| 13.0 | 2.10.1 | June 16, 2012 | Official version 2.10.1 release. |
| 14.0 | 2.11 beta 1 | June 8, 2012 | First beta release. |
| 14.0 | 2.11 beta 2 | June 14, 2012 | Second beta release. |
| 14.0 | 2.11 beta 3 | June 23, 2012 | Third beta release. |
| 14.0 | 2.11 beta 4 | July 1, 2012 | Fourth beta release. |
| 14.0 | 2.11 beta 5 | July 6, 2012 | Fifth beta release. |
| 14.0 | 2.11 beta 6 | July 11, 2012 | Sixth beta release. |
| 14.0 | 2.11 | July 17, 2012 | Official version 2.11 release. |
| 15.0 | 2.12 beta 1 | July 21, 2012 | First beta release. |
| 15.0 | 2.12 beta 2 | July 27, 2012 | Second beta release. |
| 15.0 | 2.12 | August 28, 2012 | Official version 2.12 release. |
| 15.0 | 2.12.1 | September 10, 2012 | Official version 2.12.1 release. |
| 16.0 | 2.13 beta 1 | September 1, 2012 | First beta release. |
| 16.0 | 2.13 beta 2 | September 7, 2012 | Second beta release. |
| 16.0 | 2.13 beta 3 | September 14, 2012 | Third beta release. |
| 16.0 | 2.13 beta 4 | September 23, 2012 | Fourth beta release. |
| 16.0 | 2.13 beta 5 | September 29, 2012 | Fifth beta release. |
| 16.0 | 2.13 beta 6 | October 5, 2012 | Sixth beta release. |
| 16.0 | 2.13 | October 9, 2012 | Official version 2.13 release. |
| 16.0 | 2.13.1 | October 12, 2012 | Official version 2.13.1 release. |
| 16.0 | 2.13.2 | October 27, 2012 | Official version 2.13.2 release. Last version supported on Mac OS X 10.5 |
| 17.0 | 2.14 beta 1 | October 22, 2012 | First beta version. |
| 17.0 | 2.14 beta 2 | October 26, 2012 | Second beta version. |
| 17.0 | 2.14 beta 3 | November 2, 2012 | Third beta version. |
| 17.0 | 2.14 beta 4 | November 9, 2012 | Fourth beta version. |
| 17.0 | 2.14 beta 5 | November 9, 2012 | Fifth beta version. |
| 17.0 | 2.14 | November 9, 2012 | Official version 2.14. |
| 17.0 | 2.14.1 | November 30, 2012 | Official version 2.14.1. |
| 18.0 | 2.15 beta 1 | November 26, 2012 | First beta version. |
| 18.0 | 2.15 beta 2 | December 9, 2012 | Second beta version. |
| 18.0 | 2.15 beta 3 | December 7, 2012 | Third beta version. |
| 18.0 | 2.15 beta 4 | December 14, 2012 | Fourth beta version. |
| 18.0 | 2.15 beta 5 | December 21, 2012 | Fifth beta version. |
| 18.0 | 2.15 beta 6 | January 2, 2013 | Sixth beta version. |
| 18.0 | 2.15 | January 8, 2013 | Official version 2.15 release. |
| 18.0 | 2.15.1 | January 20, 2013 | Official version 2.15.1 release. |
| 18.0 | 2.15.2 | February 4, 2013 | Official version 2.15.2 release. |
| 19.0 | 2.16 beta 1 | January 12, 2013 | First beta version. |
| 19.0 | 2.16 beta 2 | January 27, 2013 | Second beta version. |
| 19.0 | 2.16 beta 3 | February 1, 2013 | Third beta version. |
| 19.0 | 2.16 beta 4 | February 8, 2013 | Fourth beta version. |
| 19.0 | 2.16 beta 5 | February 15, 2013 | Fifth beta version. |
| 19.0 | 2.16 | February 21, 2013 | Official version 2.16 release. |
| 19.0 | 2.16.1 | March 8, 2013 | Official version 2.16.1 release. |
| 19.0 | 2.16.2 | March 13, 2013 | Official version 2.16.2 release. |
| 20.0 | 2.17 beta 1 | February 26, 2013 | First beta version. |
| 20.0 | 2.17 beta 2 | March 18, 2013 | Second beta version. |
| 20.0 | 2.17 beta 3 | March 24, 2013 | Third beta version. |
| 20.0 | 2.17 beta 4 | March 28, 2013 | Fourth beta version. |
| 20.0 | 2.17 | April 2, 2013 | Official version 2.17 release. |
| 20.0 | 2.17.1 | April 14, 2013 | Official version 2.17.1 release. |
| 21.0 | 2.18 beta 1 | April 5, 2013 | First beta version. |
| 21.0 | 2.18 beta 2 | April 19, 2013 | Second beta version. |
| 21.0 | 2.18 beta 3 | April 27, 2013 | Third beta version. |
| 21.0 | 2.18 beta 4 | May 3, 2013 | Fourth beta version. |
| 21.0 | 2.18 | Not released | Official version 2.18 has been skipped due to technical problems with the build architecture. |
| 22.0 | 2.19 beta 1 | June 20, 2013 | First beta version. |
| 22.0 | 2.19 beta 2 | June 26, 2013 | Second beta version. |
| 22.0 | 2.19 | July 2, 2013 | Official version 2.19 release. |
| 23.0 | 2.20 beta 1 | July 9, 2013 | First beta version. |
| 23.0 | 2.20 beta 2 | July 23, 2013 | Second beta version. |
| 23.0 | 2.20 beta 2 | July 30, 2013 | Third beta version. |
| 23.0 | 2.20 | August 6, 2013 | Official version 2.20 release. TLS 1.1 support. |
| 24.0 | 2.21 beta 1 | September 7, 2013 | First beta version. |
| 24.0 | 2.21 beta 2 | September 11, 2013 | Second beta version. |
| 24.0 | 2.21 | September 17, 2013 | Official version 2.21 release. TLS 1.2 support. |
| 25.0 | 2.22 beta 1 | October 21, 2013 | First beta version. |
| 25.0 | 2.22 beta 2 | October 25, 2013 | Second beta version. |
| 25.0 | 2.22 | October 30, 2013 | Official version 2.22 release. |
| 25.0 | 2.22.1 | November 18, 2013 | Official version 2.22.1 release. |
| 26.0 | 2.23 beta 1 | December 6, 2013 | First beta version. |
| 26.0 | 2.23 beta 2 | December 8, 2013 | Second beta version. |
| 26.0 | 2.23 | December 12, 2013 | Official version 2.23 release. |
| 27.0 | 2.24 beta 1 | February 3, 2014 | First beta version. |
| 27.0 | 2.24 | February 6, 2014 | Official version 2.24 release. |
| 28.0 | 2.25 beta 1 | February 13, 2014 | First beta version. |
| 28.0 | 2.25 beta 2 | March 9, 2014 | Second beta version. |
| 28.0 | 2.25 beta 3 | March 14, 2014 | Third beta version. |
| 28.0 | 2.25 | March 19, 2014 | Official version 2.25 release. |
| 29.0 | 2.26 beta 1 | April 9, 2014 | First beta version. |
| 29.0 | 2.26 beta 2 | April 18, 2014 | Second beta version. |
| 29.0 | 2.26 | May 2, 2014 | Official version 2.26.0 release. |
| 29.0 | 2.26.1 | June 16, 2014 | Official version 2.26.1 release. |
| 30.0 | 2.27 | Not released | Official version 2.27 has been skipped due to technical problems with the build architecture. |
| 31.0 | 2.28 | Not released | Official version 2.28 has been skipped due to technical problems with the build architecture. |
| 32.0 | 2.29 beta 1 | August 27, 2014 | First beta version. |
| 32.0 | 2.29 beta 2 | September 2, 2014 | Second beta version. |
| 32.0 | 2.29 | September 7, 2014 | Official version 2.29 release. |
| 32.0 | 2.29.1 | September 24, 2014 | Official version 2.29.1 release. |
| 33.0 | 2.30 beta 1 | October 9, 2014 | First beta version. |
| 33.0 | 2.30 beta 2 | October 12, 2014 | Second beta version. |
| 33.0 | 2.30 | October 15, 2014 | Official version 2.30 release. |
| 34.0 | 2.31 beta 1 | November 2, 2014 | First beta version. |
| 34.0 | 2.31 beta 2 | November 28, 2014 | Second beta version. |
| 34.0 | 2.31 | December 4, 2014 | Official version 2.31 release. |
| 35.0 | 2.32 beta 1 | December 16, 2014 | First beta version. |
| 35.0 | 2.32 beta 2 | December 21, 2014 | Second beta version. |
| 35.0 | 2.32 beta 3 | January 4, 2015 | Third beta version. |
| 35.0 | 2.32 | January 13, 2015 | Official version 2.32 release. |
| 35.0 | 2.32.1 | February 6, 2015 | Official version 2.32.1 release. |
| 36.0 | 2.33 beta 1 | February 26, 2015 | First beta version. |
| 36.0 | 2.33 | March 10, 2015 | Official version 2.33 release. |
| 36.0 | 2.33.1 | March 24, 2015 | Official version 2.33.1 release. |
| 37.0 | 2.34 | Not released | Official version 2.34 has been skipped. |
| 38.0 | 2.35 | September 3, 2015 | Official version 2.35 release. |
| 39.0 | 2.36 | Not released | Official version 2.36 has been skipped. |
| 40.0 | 2.37 | Not released | Official version 2.37 has been skipped. |
| 41.0 | 2.38 beta 1 | September 7, 2015 | First beta version. |
| 41.0 | 2.38 | September 26, 2015 | Official version 2.38 release. |
| 42.0 | 2.39 beta 1 | November 2, 2015 | First beta version. |
| 42.0 | 2.39 | November 8, 2015 | Official version 2.39 release. |
| 43.0 | 2.40 | March 14, 2016 | Official version 2.40 release. This is the last version to support CPUs without SSE2 under Windows. This is the last version to support Mac OS X 10.6-10.8. |
| 44.0 | 2.41 | Not released | Official version 2.41 has been skipped. |
| 45.0 | 2.42 | Not released | Official version 2.42 has been skipped. |
| 46.0 | 2.43 | Not released | Official version 2.43 has been skipped. |
| 47.0 | 2.44 | Not released | Official version 2.44 has been skipped. |
| 48.0 | 2.45 | Not released | Official version 2.45 has been skipped. |
| 49.0 | 2.46 | December 22, 2016 | Official version 2.46 release. |
| 50.0 | 2.47 | Not released | Official version 2.47 has been skipped in favour of 2.46. |
| 51.0 | 2.48 beta 1 | April 15, 2017 | First beta version. |
| 51.0 | 2.48 | July 31, 2017 | Official version 2.48 release. This is the last version to support GTK2 on Linux. |
| 52.4 | 2.49.1 | November 4, 2017 | Official version 2.49.1 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52. |
| 52.6 | 2.49.2 | February 15, 2018 | Official version 2.49.2 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52. |
| 52.7.3 | 2.49.3 | May 4, 2018 | Official version 2.49.3 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52. |
| 52.9.1 | 2.49.4 | July 27, 2018 | Official version 2.49.4 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52. This is the last version to support plugins other than Flash on macOS. |
| 52.9.1 | 2.49.5 | September 4, 2019 | Official version 2.49.5 release. Built from the same Extended Support Release (ESR) branch as Firefox 52 ESR and Thunderbird 52. This is the last version to support Windows XP/Server 2003 and Windows Vista/Server 2008. This is the last version to support ALSA on Linux. This is the last version to support NPAPI plugins other than Flash. |
| 60.3 and later | 2.53.1 beta 1 | January 18, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.3 and later | 2.53.1 | February 28, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.3 and later | 2.53.2 beta 1 | April 15, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.3 and later | 2.53.2 | May 3, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.4 and later | 2.53.3 beta 1 | June 15, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.4 and later | 2.53.3 | July 7, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.6 and later | 2.53.4b1 | August 20, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.6 and later | 2.53.4 | September 22, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.5b1 | October 29, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.5 | November 13, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.5.1 | November 17, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.6b1 | December 28, 2020 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.6 | January 22, 2021 | Last version to include support for NPAPI plugins. |
| 60.8 and later | 2.53.7 | March 10, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.7.1 | April 15, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.8b1 | May 31, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.8 | June 30, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.9b1 | August 11, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.9 | August 26, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.9.1 | September 28, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.10b1 | October 29, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.10 | November 16, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.10.1 | December 13, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.10.2 | December 28, 2021 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.11b1 | January 30, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.11 | March 2, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.11.1 | March 25, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.12b1 | April 23, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.12 | May 4, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.13b1 | June 16, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.13 | July 11, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.14b1 | August 31, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.14 | September 29, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.15b1 | December 7, 2022 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.15 | January 20, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.16b1 | February 28, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.16 | March 31, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.17b1 | June 20, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.17 | August 4, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.17.1 | September 20, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.18b1 | November 14, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.18 | December 9, 2023 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.18.1 | January 16, 2024 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.18.2 | March 28, 2024 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.19 beta 1 | July 18, 2024 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.19 | September 4, 2024 | Updates backported from multiple Extended Support Release (ESR) branches. |
| 60.8 and later | 2.53.20 | January 7, 2025 | Updates backported from multiple Extended Support Release (ESR) branches. |