Tuesday, 22 September 2026 @ 02:02 UTC~2214,580172,138

SeaMonkey

SeaMonkey e.V.·Mozilla.SeaMonkey

Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing made simple—all your Internet needs in one application.

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite. Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates as well as new features and improvements to this concept. Containing an Internet browser, email & newsgroup client, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users. SeaMonkey is built on the open source Mozilla Gecko engine, the same code which underlies the highly successful Thunderbird and is the base for the Firefox browser. SeaMonkey benefits from the cross-fertilization with these other projects, by gaining (and contributing) new features and the ongoing security updates which are a modern necessity. The SeaMonkey Association provides legal backing for the SeaMonkey Project.

winget install --id Mozilla.SeaMonkey --exact --source winget

Latest 2.53.24·July 28, 2026

Release Notes

The SeaMonkey project is proud to present SeaMonkey 2.53.24: The new release of the all-in-one Internet suite is available for free download now! 2.53.24 is an incremental update on the 2.53.x branch and incorporates a number of enhancements, changes and fixes to the application as well as those from the underlying platform code. We have also added many fixes and backports for overall platform stability. Please be advised that 2.53.21 was the last release with 32-bit versions for Windows and Linux, this version is only 64-bit. Our Windows signing key expired and the way new keys are distributed totally changed. We are working on acquiring a new key and integrating the new signing process into our infra, but it will take some time to complete. So until we accomplish this, starting with 2.53.21b1, our Windows releases will be distributed unsigned. If you are concerned about the integrity of the downloads please check the binaries against the checksum files we provide. If you are using macOS 15.1.x please update to 15.2. Because of a bug in the OS SeaMonkey can not be started via Finder or Dock without workarounds. This applies to older SeaMonkey versions too. We are aware of numerous websites breaking because of only supporting the latest Chrome or Firefox versions. We are trying to address this and progress has been made in a different source code branch but the code is not ready for general distribution yet. SeaMonkey 2.53.24 is available in 24 languages, for Windows x64, macOS x64 and Linux x64. Automatic upgrades from previous 2.53.x versions are enabled for this release, but if you have problems with it please download the full installer from the downloads section and install SeaMonkey 2.53.24 manually over the previous version. For a more complete list of major changes in SeaMonkey 2.53.24, see the What's New in SeaMonkey 2.53.24 section of the Release Notes, which also contains a list of known issues and answers to frequently asked questions. For a more general overview of the SeaMonkey project (and screen shots!), visit www.seamonkey-project.org. We encourage users to get involved in discussing and reporting problems as well as further improving the product.

Installer type: nullsoft

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Details

Homepage
https://www.seamonkey-project.org/releases/
License
MPL-2.0
Publisher
SeaMonkey e.V.
Support
https://www.seamonkey-project.org/community
Privacy Policy
https://www.seamonkey-project.org/legal/privacy
Copyright
© SeaMonkey Developers, according to the MPL 1.1/GPL 2.0/LGPL 2.1 licenses, as applicable.
Moniker
seamonkey

Tags

browseremailgeckointernetmailwebweb-browserwebpage

Older versions (15)

2.53.23
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2.53.20
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2.53.19
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2.53.18.1
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2.53.16
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2.53.13
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2.53.12
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2.53.11
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2.53.10.2
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2.53.9.1
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2.53.9
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2.53.8.1
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