SeaMonkey 2.53.12

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

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SeaMonkey 2.53.12
Platform:
Language:
Language Version Windows
x64
Windows
x86
macOS
x64
Linux
x64
Linux
x86
Chinese (Simplified) 中文 (简体) 2.53.12 Download Download Download Download Download
Chinese (Traditional) 正體中文 (繁體) 2.53.12 Download Download Download Download Download
Czech Čeština 2.53.12 Download Download Download Download Download
Dutch Nederlands 2.53.12 Download Download Download Download Download
English (British) English (British) 2.53.12 Download Download Download Download Download
English (US) English (US) 2.53.12 Download Download Download Download Download
Finnish suomi 2.53.12 Download Download Download Download Download
French Français 2.53.12 Download Download Download Download Download
Georgian ქართული 2.53.12 Download Download Download Download Download
German Deutsch 2.53.12 Download Download Download Download Download
Greek Ελληνικά 2.53.12 Download Download Download Download Download
Hungarian Magyar 2.53.12 Download Download Download Download Download
Italian Italiano 2.53.12 Download Download Download Download Download
Japanese 日本語 2.53.12 Download Download Download Download Download
Norwegian (Bokmål) Norsk bokmål 2.53.12 Download Download Download Download Download
Polish Polski 2.53.12 Download Download Download Download Download
Portuguese (Brazilian) Português (do Brasil) 2.53.12 Download Download Download Download Download
Portuguese (Portugal) Português (Europeu) 2.53.12 Download Download Download Download Download
Russian Русский 2.53.12 Download Download Download Download Download
Slovak slovenčina 2.53.12 Download Download Download Download Download
Spanish (Argentina) Español (de Argentina) 2.53.12 Download Download Download Download Download
Spanish (Spain) Español (de España) 2.53.12 Download Download Download Download Download
Swedish Svenska 2.53.12 Download Download Download Download Download

The SeaMonkey® Project

The SeaMonkey project is a community effort to develop the SeaMonkey Internet Application Suite (see below). Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept. Containing an Internet browser, email & newsgroup client with an included web feed reader, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

Under the hood, SeaMonkey uses much of the same Mozilla Firefox source code which powers such products as Thunderbird. Legal backing is provided by the SeaMonkey Association (SeaMonkey e.V.).

Project News

May 4, 2022

SeaMonkey 2.53.12 released

The SeaMonkey project is proud to present SeaMonkey 2.53.12: The new release of the all-in-one Internet suite is available for download now! 2.53.12 is an incremental update from the 2.53.x branch and incorporates a number of changes as well as fixes from the underlying platform code. NPAPI plugin support has been removed and also has support for building with clang 4 and gcc 6. Additional important security fixes up to the current Firefox / Thunderbird 91.9 ESR are included too. Read the full Release Notes for further information.

If you are upgrading from a 2.49.5 or older release we strongly advise you to make a full backup of your profile before installing the new version.

SeaMonkey 2.53.12 is available in 23 languages, for Windows, macOS x64 and Linux.

Automatic upgrades from previous 2.53.x versions are enabled for this release, but if you have problems with it upgrading or you need to upgrade from a version earlier than 2.53.5, please download the full installer from the downloads section and install SeaMonkey 2.53.12 manually over the previous version.

For a more complete list of major changes in SeaMonkey 2.53.12, see the What's New in SeaMonkey 2.53.12 section of the Release Notes, which also contain 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.

April 23, 2022

SeaMonkey 2.53.12 Beta 1 released

SeaMonkey 2.53.12 Beta 1 is now available for free download on the SeaMonkey website.

2.53.12 will be 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. NPAPI plugin support has been removed, as also has support for building with clang 4 and gcc 6. Before installing it make a full backup of your profile and thoroughly read and follow the Release Notes. We encourage testers to get involved in discussing and reporting problems as well as further improving the product.

SeaMonkey 2.53.12 Beta 1 is available in 23 languages, for Windows, macOS x64 and Linux.

The SeaMonkey Internet Application Suite

SeaMonkey has inherited the successful all-in-one concept of the original Netscape Communicator and continues that product line based on the modern, cross-platform architecture provided by the Mozilla project.