SeaMonkey Download & Releases

Main Downloads

SeaMonkey 2.53.18.1

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SeaMonkey 2.53.18.1

Released January 16, 2024

  • Release Notes - The release notes describe new changes, system requirements, installation instructions, and known issues in this release - please read them carefully before using this version of SeaMonkey!
  • This version of SeaMonkey makes changes to your profile that can't be reverted in the case where you want to go back to a version earlier than 2.53.1. You MUST absolutely do a full backup of your profile before using this application.
  • If you are using NoScript you might encounter a certificate error when trying to download SeaMonkey from this site. NoScript tries to force an https connection for an http only site. It is not a NoScript problem but how the Mozilla server, from which downloads are delivered, is configured.
    In this case please add download.cdn.mozilla.net to the NoScript "Never force secure (HTTPS) connections" options or turn off NoScript for this download only. The settings are located in the NoScript options under "Advanced->HTTPS".

Official builds

MD5 sums and SHA1 sums are available for official packages and source tarballs.

Language Version Windows
x64
Windows
x86
macOS
x64
Linux
x64
Linux
x86
Chinese (Simplified) 中文 (简体) 2.53.18.1 Download Download Download Download Download
Chinese (Traditional) 正體中文 (繁體) 2.53.18.1 Download Download Download Download Download
Czech Čeština 2.53.18.1 Download Download Download Download Download
Dutch Nederlands 2.53.18.1 Download Download Download Download Download
English (British) English (British) 2.53.18.1 Download Download Download Download Download
English (US) English (US) 2.53.18.1 Download Download Download Download Download
Finnish suomi 2.53.18.1 Download Download Download Download Download
French Français 2.53.18.1 Download Download Download Download Download
Georgian ქართული 2.53.18.1 Download Download Download Download Download
German Deutsch 2.53.18.1 Download Download Download Download Download
Greek Ελληνικά 2.53.18.1 Download Download Download Download Download
Hungarian Magyar 2.53.18.1 Download Download Download Download Download
Italian Italiano 2.53.18.1 Download Download Download Download Download
Japanese 日本語 2.53.18.1 Download Download Download Download Download
Norwegian (Bokmål) Norsk bokmål 2.53.18.1 Download Download Download Download Download
Polish Polski 2.53.18.1 Download Download Download Download Download
Portuguese (Brazilian) Português (do Brasil) 2.53.18.1 Download Download Download Download Download
Portuguese (Portugal) Português (Europeu) 2.53.18.1 Download Download Download Download Download
Russian Русский 2.53.18.1 Download Download Download Download Download
Slovak slovenčina 2.53.18.1 Download Download Download Download Download
Spanish (Argentina) Español (de Argentina) 2.53.18.1 Download Download Download Download Download
Spanish (Spain) Español (de España) 2.53.18.1 Download Download Download Download Download
Swedish Svenska 2.53.18.1 Download Download Download Download Download

Source code

The source code is available either as a tar package or from the comm source repository, mozilla source repository and l10n source repository on GitLab.

  • Source Code Tarball (xz, 254 MB) - note that it doesn't unpack a subdirectory itself, so create a directory to unpack it in.
  • Source Localisation Tarball (xz, 14 MB) - note that it doesn't unpack a subdirectory itself, so create a directory to unpack it in.
  • The README file explains how to pull SeaMonkey 2.53.18.1 from the source repository.

Language Packs

SeaMonkey 2.53.18 Beta 1

Released November 14, 2023

  • Release Notes - The release notes describe new changes, system requirements, installation instructions, and known issues in this release - please read them carefully before using this version of SeaMonkey!
  • This preview of SeaMonkey's future is available from the SeaMonkey 2.53.18 Beta 1 download page.

Old and Unofficial Releases

The SeaMonkey Project only supports the latest stable version of SeaMonkey. The below versions are only listed for historical reasons.
For some legacy platforms like PPC Mac, the SeaMonkey Project has dropped support. There are however independent projects that continue to support some of these platforms. To learn more, see Latest Releases for Legacy Platforms.

Previously released versions of SeaMonkey: