SeaMonkey for Mac

Used SeaMonkey for Mac?

SeaMonkey Analysis

AI Assisted Content · June 11, 2026

Not written by CNET Staff.

SeaMonkey is a free, open-source web browser designed for Mac users, featuring a suite of internet tools including email, chat, and web development utilities. As a comprehensive suite, it combines a web browser, email client, IRC chat client, and HTML editor, providing an all-in-one solution for online activities. SeaMonkey is built on the Mozilla platform, ensuring compatibility with a wide range of web standards and technologies.

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The browser includes features such as tabbed browsing, customizable toolbars, and a built-in feed reader, enhancing user experience and productivity. Additionally, SeaMonkey supports various extensions and themes, allowing users to personalize their browsing experience. Its integrated email client supports multiple accounts and offers advanced filtering options, while the HTML editor provides tools for developing and editing web pages efficiently. Overall, SeaMonkey serves as a versatile tool for both casual users and developers.

SeaMonkey for Mac

Used SeaMonkey for Mac?

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Full Specifications

GENERAL

Release: October 12, 2020

Latest update: June 11, 2026

Version: 2.53.4

OPERATING SYSTEMS

Platform: Mac

Operating System: Mac OS X

Additional Requirements

macOS Catalina
macOS Mojave
macOS High Sierra
macOS Sierra
OS X El Capitan
OS X Yosemite

POPULARITY

Total Downloads: 39,951

Downloads Last Week: 0

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Last Updated

User Reviews

3.9/5

33 User Votes

SeaMonkey 2.26.1
June 21, 2014
Pros
This is a fairly easy to use browser. I downloaded it to use it with the AARP web site since Firefox and Safari no longer do. SeaMonkey will be my backup browser instead of Opera. SeaMonkey is similar enough to Firefox that I could make it my go to browser.
Cons
Some of the SeaMonkey preferences/settings are not easy to find. Even though it's from Mozilla, the preferences menu is not the same as Firefox's preferences menu.
Summary
SeaMonkey is a decent browser for most users whether they prefer links to open in tabs or to open in separate windows. It really is flexible in that respect.
My favourite browser
PaulKBFebruary 8, 2014
Pros
This is the only internet suite still being developed. In the early internet days Internet suites were more common. SeaMonkey integrates browser, email, and a simple (but for me adequate) html web editor. I love the integration between the browser and mail. Seamonkey uses the same rendering engine (GECKO) as Firefox and much of the low level functioning of the email component is shared with the ThunderBird email program. What makes SeaMonkey shine is the close integration between browser and mail. SeaMonkey is not the combination of FireFox and ThunderBird into one program. SeaMonkey is a number of tweaks to the user interface and a close integration between the browser and mail which creates an internet suite which functions much better for many users than a separate browser and mail programs.
Cons
The only negative I am able to think of is that there is no mobile version of SeaMonkey for tablets and phones.
Summary
Try SeaMonkey. It may become a favorit for browsing and email. Oh SeaMonkey does not force you to use its email program. If you prefer to use another email program you can set a preference in SeaMonkey so that when you click on an email address in the browser it will call up your email client of choice.
Nice to play with. Won't put too much stock in it.
dmcfallsJanuary 26, 2013
Pros
Nice but incomplete interface.
Cons
Nice but incomplete interface.
Summary
Nice to play with. Won't put too much stock in it. Not until there's some serious amount of more work put into it.
Awesome - Fast and user friendly
January 19, 2012
Pros
I am an older retired woman and I like things user friendly. Seamonkey is, I play farmville - by Zynga (a game) and was surprised at how fast the game loaded. If you like things easy this is so much better than IE!!!
Cons
none so far
Summary
still a work in progress...
danakaoDecember 31, 2011
Pros
Reasonably fast; doesn't crash when some applications (such as Flash) are used
Cons
Must use search engine to access a site--cannot go directly to a site just by typing in the web address.
Summary
As I mentioned, still a work in progress. Hopefully more people will discover SeaMonkey and this browser will be more polished as a result.
Fairly reliable backup browser
danakaoDecember 1, 2011
Pros
Reasonably fast; I've experienced no crashes
Cons
Not as versatile as more common browsers like Firefox, Chrome, or Safari
Summary
Lack of versatility hurts this otherwise competent browser.
system requirements in error
Identity-usJune 13, 2011
Pros
I have always liked and used SeaMonkey, but I am unable to run this version because
Cons
despite stated requirements, this version requires at least OS X.5 and an Intel processor.
Summary
Great.....
PaulKBJune 7, 2011
Pros
The best browser and email. Fast.
Cons
Can't think of any.
Summary
My Browser of choice. My Email of choice. Fast, very stable.
Does everything, fast and efficiently
peripoMay 7, 2011
Pros
Fast, clean lines, very customisable
Cons
nothing i can think of.
Summary
I downloaded SeaMonkey to give it a try because it was touted as being faster than all the rest. It's really good but doesn't do anything other browsers don't do and I don't find it any faster than Safari. I probably won't use it as my default but it's worth keeping and it updates it's add-ons automatically without fanfare like Firefox or IE.
Love it but, CNET, get the download info right!
ricklibJanuary 31, 2011
Pros
Sea Monkey is my second favorite browser after Safari. Simple to use. Good for teaching kids.
Cons
Only that CNET won't get the version number right. Very annoying and diminishes my confidence in them.
Summary
Good browser

Developer’s Description

Reveal, refine, and take full advantage of high-performance, all-in-one Internet application suite.

SeaMonkey is the all-in-one internet application suite formerly known as the "Mozilla Application Suite", containing a Web browser, a mail and newsgroups client, an HTML editor, Web development tools, and an IRC chat client in a single software package.