SeaMonkey

ApplicationSeaMonkey Council

Also called seamonkey suite, mozilla suite

SeaMonkey CouncilBrowsers

An application suite: browser plus MailNews from the old Mozilla suite. On Windows the process is seamonkey.exe.

What you need to know

SeaMonkey is a suite. It is not Firefox alone.

The SeaMonkey Council ships browser plus MailNews as seamonkey.exe. Firefox is only a browser. Thunderbird is only mail.

What is it?: Internet suite
Still current?: Yes, see Current status
Official download?: Use the vendor link in this article

Feex says

If seamonkey.exe is open, I would look for MailNews in the same app. Closing firefox.exe does not quit SeaMonkey.

What is SeaMonkey?

SeaMonkey is the SeaMonkey Council suite: Navigator-style browser, MailNews, and Composer. The Windows executable is seamonkey.exe.

If you have never used it

If you want the old Mozilla suite idea, this is SeaMonkey: browser plus MailNews in one app. It is not Firefox alone. Download it from seamonkey-project.org/releases. The process is seamonkey.exe. Thunderbird plus Firefox is a different pair of products.

What is it used for?

Browse in the suite browser

The web window is one part of SeaMonkey. It is not a standalone Firefox profile.

MailNews

Mail and newsgroups live in the same app. Thunderbird is a different exe.

Composer

A leftover HTML editor from the suite era. It is not Word and not VS Code.

Who is it for?

People who still want a Mozilla-style suite
Users migrating old SeaMonkey MailNews profiles
Anyone who searched Firefox and landed on this suite

Current status

SeaMonkey (2005) is a current internet suite from SeaMonkey Council. The vendor still points Windows users at https://www.seamonkey-project.org/releases/.

How old is it?

SeaMonkey 1.0 shipped in 2005 as the community continuation of the Mozilla Application Suite. It is younger than Netscape Communicator and older than most Chromium browsers. Current SeaMonkey is still a suite, not a Firefox reskin.

Versions

Major channels first. Exact build numbers are not all verified here.

Current Windows build

System requirements

Values follow the publisher's public guidance. Workload still changes the real need.

Minimum

Minimum system requirements
Operating system	A current supported Windows 10 or Windows 11 release, per the vendor
RAM	Enough for Windows plus this app. Heavy projects want more.

Resource profile

CPU demand: Follows what you open inside the app
RAM demand: Follows documents, tabs, or libraries

Installed processes

These executables belong to this product when it is installed.

Installed processes
seamonkey.exe	Main Windows executable

Startup components

SeaMonkey can open mail at launch. That is a suite option, not a Windows mail service.

File locations

Common SeaMonkey locations
Typical install	C:\Program Files\SeaMonkey\

File formats

HTMLEMLMBOX

Common problems

Modern web and mail defaults feel old

The suite moves slower than Firefox Rapid Release. That is expected, not a failed install.

People uninstall Firefox to remove mail

SeaMonkey mail is inside seamonkey.exe. Firefox does not host it.

Getting unstuck

Confirm seamonkey.exe, not firefox.exe

The suite lives under SeaMonkey. Mozilla Firefox is a different folder.

Use SeaMonkey project docs for MailNews

Thunderbird help will name the wrong profile path.

Install from seamonkey-project.org/releases

A SeaMonkey gold listing is junk.

Alternatives

Firefox plus Thunderbird if you want separate modern apps. Pale Moon if you want an independent browser without MailNews.

Official help and downloads

Start with the vendor. Random exe sites are not a support channel.

Official contacts
Download	www.seamonkey-project.org/releases/ Official installer or vendor page
Help	www.seamonkey-project.org/doc/ Vendor support
Official site	www.seamonkey-project.org/ Start here, not a random exe host

Related hardware

RAM follows open mail plus tabs. A current GPU driver still helps video in the browser window.

Technical details

Vendor version numbers change. This article does not pin a build.

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.

SeaMonkey official site · Vendor product page
SeaMonkey help · Vendor support
Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.

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