These binaries were all built from mozilla's comm-esr56 Mercurial repository,
off the SeaMonkey_2_53_1b1_RELEASE tag, with the following commands used to obtain
the source:

   hg clone -r SeaMonkey_2_53_1b1_RELEASE https://hg.mozilla.org/releases/comm-esr56
   cd comm-esr56
   python client.py checkout --rev SeaMonkey_2_53_1b1_RELEASE

This directory contains precompiled binaries of SeaMonkey 2.53.1b1

A list of ftp.mozilla.org's mirror sites can be found at:
   https://www.mozilla.org/mirrors.html

Read https://developer.mozilla.org/en/Build_Documentation for instructions
on how to build your own copy of SeaMonkey.

Language packs are available from the langpacks/ subdirectory and can be
installed as add-ons and switched to using the Appearance preferences.

linux-i686 and linux-x86_64 .tar.bz2 files are tarball builds
 for Linux on the x86 and x86_64 platforms.

mac/ .dmg files are self-mounting disk images for Mac OS X, containing
Intel32+Intel64 universal binaries.

A source code tarball with the contents of comm-central/ in such a checkout is
available for download from the source/ subdirectory here on FTP.

The .exe files in win32/ and win64/ are the main win32/win64release installers respectively, letting you
chose which extensions to install.

The .zip files in win32/ and win64/ contain a full optimized build without an installer.
If you do not understand how to get this to run, you should use installer.exe instead.

Please read the release notes at
  https://www.seamonkey-project.org/releases/seamonkey2.53.1b1/