SeaMonkey, Portable Edition v2.53.15

freakazoid on 29 Jan 2023

SeaMonkey is a complete internet suite with web browser, email & newsgroup client with an included web feed reader, easy HTML editor, IRC chat and web development tools. The browser supports fine-grained controls over images, cookies and more on a per-site basis. Based on Netscape Communicator and then Mozilla Suite, this software bundle includes many technologies used in Mozilla Firefox and Thunderbird and supports many of their add-ons.

SeaMonkey, Portable Edition is a version of the software from and works automatically with web-based Java apps if their jPortable tool is present.

For those using Windows XP and Vista, the last supported version was 2.49.5.

Runs on:Win7 / Win8 / Win10 / Win11 / Wine
Writes settings to: Application folder
Stealth: ? Yes
Unicode support: Yes
Path portability: Automatic relative path (eg. ..\..\personal\work.doc)
License: Freeware/Open Source
How to extract: Download the self-extracting EXE and extract to a folder of your choice. Launch SeaMonkeyPortable.exe.
Similar/alternative apps: Mozilla Firefox, Pale Moon Portable, Opera
What's new? See:

14 comments on SeaMonkey, Portable Edition  The Portable Freeware Collection Latest Entries Feed

freakazoid 2021-01-30 13:14

@loin2kolpotoru I've updated the compatibility field and added a note about last supported XP/Vista version.


loin2kolpotoru 2021-01-30 07:56

Entry should be updated Seamonkey is no longer compatible with XP


Midas 2020-10-21 14:38

For details on why Seamonkey Portable isn't being updated, please see


Midas 2017-01-09 01:02

Indeed. Please check the forum topic to see if your results match mine...


freakazoid 2017-01-08 08:44

I use SeaFox as well, but I just use the Default theme.

Classic Firefox theme for SeaMonkey doesn't really make much of a difference in my layout, except a few icon changes.

Speaking of icons, use the Classic Toolbar Buttons addon to change some of the default icons. It doesn't change the Bookmark, RSS or Tab Throbber icons though.


Midas 2017-01-07 22:46

@freakzoid: the "Classic Firefox theme for SeaMonkey" may be what you're looking for: ...

I use both this and the SeaFox extension ( and after some further tweaking, I am pretty satisfied with the results.


freakazoid 2017-01-05 15:00

So I've taken another look at SeaMonkey recently and while some of my comments above are still true, SeaMonkey is actually quite a lightweight version of Firefox and Thunderbird.

To convert some Firefox and Thunderbird addons to work with SeaMonkey, use the following site:

I've made a bunch of UI customizations using Stylish and it is looking better, but the default theme is still ugly as hell. Definitely stuck in the past. Wish I could easily change the default icons, but other than that, I'm quite pleased with SeaMonkey's performance.

I've finally added SM to my favorites.


donald 2013-09-21 21:11

So that author could do the same for Seamonkey?
Or is the app SeaMonkey compatible.


donald 2013-09-21 04:15

Hmm ...
When you make it seem that easy, perhaps a new SeaMonkey Add-on could do that automatically as well?
Perhaps we could suggest such an add-on?
But would the add-on site host it?


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