SeaMonkey for Mac
Web browser with IRC chat, HTML editing, and more.
Free
In English
Version 2.53.23When you purchase through links on our site, we may earn an affiliate commission
SeaMonkey overview
SeaMonkey is a Web browser that shares much of the same base code as the popular Firefox Web browser. It also contains an advanced e-mail and newsgroup client, IRC chat client, and HTML editor.
The SeaMonkey project is a community effort to deliver production-quality releases of code derived from the application formerly known as "Mozilla Application Suite". Whereas the main focus of the Mozilla Foundation is on Mozilla Firefox and Mozilla Thunderbird, our group of dedicated volunteers works to ensure that you can have "everything but the kitchen sink" and have it stable enough for corporate use.
What's new in version 2.53.23
Changes
- Use PluralForm for known networks in cZ bug 1986545.
- Use PluralForm better for known networks in cZ bug 1999832.
- Add ESR 140 links to debugQA bug 1993800.
- Incorrect SeaMonkey version number in BugSplat crash reports bug 1999135.
- Update service name in dataman.js bug 1489573.
Gecko Source Code Bug Fixes
- Fixed CSS issue by landing part 1 of bug 1363875.
SeaMonkey for Mac
Free
In English
Version 2.53.23
Write a detailed review about SeaMonkey
(357 Reviews of SeaMonkey)
Comments
User Ratings
Dec 19, 2025
Version: 2.53.22
When attempting to run a new version of SeaMonkey for the first time, Apple will stop it. "Apple could not verify "SeaMonkey.app" is free of malware...", what to do is: (1) Open System Settings (2) Open Privacy & Security (3) Scroll down to "Security" and find "SeaMonkey" listed as trying to open. (4) Click "Open Anyway". (5) Go back and run SeaMonkey again. It works. - - It's still Intel only. NOTE that you are responsible for the security of your Mac. Clicking "Open Anyway" is a workaround that may be insecure. Blame the foot dragging SeaMonkey developers. 😠
Nov 28, 2025
Version: 2.53.22
This new SeaMonkey 2.53.22 won't work on my Mac OS 26.1 either, just like the previous versions. I always get notified about this fact. Why do they keep trying?
Dec 11, 2023
Version: 2.53.18
It's still Intel-Only. That's food dragging at this point. 😤
Aug 7, 2023
Version: 2.53.17
I tried this again, but the same problems persist after the update. Too much intrusive advertising popping-up and taking up too much room on the screen despite pop-ups being blocked in preferences. Why not make the extensions that are available for Firefox/Waterfox compatible with SeaMonkey? At the moment, the availability of extensions is far too limited and certain aggressive elements from the web are seizing control of the app. However, it is the speediest browser and loads webpages far quickly than any other browser.
Apr 2, 2023
Version: 2.53.16
Pop-ups, Pop-ups, Pop-ups ... and so it goes on. Even with an optional extension installed, my screen is covered in adverts. The range of extensions available for SeaMonkey isn't as extensive as Firefox - scrolling down the list, I'm told this extension is not compatible with your version (this version) of SeaMonkey. However, it seems like a speedy browser - faster than Firefox and Google.
