[Windows] Web browsing, HTML editing, web development tools, IRC chat, and more are available in SeaMonkey

SeaMonkeyThere is no shortage of browsers on the internet. However, very few people ever stray from the three most popular ones: Firefox, Chrome and Internet Explore. Despite this, there is a whole world of browsers out there for you to try. Who knows, you may end up liking one of them more than what you are using now. Today we are going to be talking about another browser that is powered Mozilla, SeaMonkey.


Main Functionality

SeaMonkey is an all-in-one application suite. These kinds of browsers were first made popular by Netscape and later by Mozilla. In short, this is not just a browser; it also offers things such as a web feed reader, IRC chat, web development tools, HTML editor and even an email and newsgroup client. This browser brings together the best of multiple worlds and puts them into one neat little package.


  • Backed by Mozilla Foundation, so it uses the same source code of other Mozilla products, like Firefox, Camino, Sunbird, and Thunderbird
  • Great all-in-one internet application suite that was made popular in the past by Netscape and Mozilla
  • Prefect for both average and advanced users. However, advanced users tend to get more out of the browser thanks to the development tools.
  • Supports most add-ons that Firefox supports: Including add-ons like Personsa, LastPass, etc.
  • Offers other tools besides just web browsing, including a web feed reader, HTML editor, IRC chat and web development tools (like error console, debug mode, etc)
  • Navigation time is usually shorter than both Firefox and Chrome. Only browser I found to be quicker was Maxthon
  • Interface is customizable. Buttons can be arranged where you want them and toolbars can be hidden and shown with just the click of an arrow presented on the left side of the toolbar.
  • Offers other common browser features like the ability to sync data and translate pages (built into the browser, no add-on needed).


  • Had some problems when trying to use the HTML editor. A few times it would corrupt the source after trying to restructure it.
  • Initial startup speed is slower than Chrome


SeaMonkey ScreenshotSeaMonkey is one of the lesser known browsers out there. Maybe it is because of its name. Whatever the reason, this is a great browser that tends to be overshadowed by its big brother Firefox. I say big brother, because SeaMonkey is made using the same source code as other Mozilla products like Thunderbird and Firefox.

So what makes SeaMonkey different? Well, SeaMonkey is not just a browser; it is an all-in-one application suite. This is because the browser also offers: a web feed reader, IRC chat, web development tools, HTML editor and even an email and newsgroup client. All of these features can be located at the button left of the browser and can be accessed with a single click. For example, click on the “Composer” icon, and you will bring up your own HTML editor.

The browser benefits from using the same source code as Firefox. First of all, it can use just about every add-on that Firefox can use. In fact, the add-on page for SeaMonkey is run by Mozilla and just has the Firefox icon replaced by the SeaMonkey icon. Just like Firefox add-ons tell you if they are compatible with your browser version or not, so do SeaMonkey add-ons.

If you care about speed, you are in luck. The initial startup time (the time it takes the browser to launch for the first time) is about 2 seconds longer than Chrome and a second faster than Firefox. This is not a big deal, because it only counts for the first time you are launching the program. After that, the average startup time is only .2 seconds slower than Chrome and about 2 seconds faster than Firefox. However, it is the navigation speed that I tend to look at the most. This is the time it takes for the browser to navigate between webpages. SeaMonkey is (on average), a second faster than Chrome and nearly 2 seconds faster than Firefox.

SeaMonkey used to not be considered a good browser, because it was missing the ability to import bookmarks, manage passwords, etc. Now, however, all of those features are present. That being said, there are a few features that are missing from SeaMonkey that you may miss. For example, the program does not support mouse gestures or voice commands. I would also like to point out that the program does not offer parent controls (without downloading an add-on), so this is a browser designed for adults.


SeaMonkey is one of those browsers that many people just overlook (like Maxthon and RockMelt). However, if you are looking to break away from the most commonly used browser, SeaMonkey is a good place to start. It is quick, can use add-ons just like Firefox and offers built-in tools that other browsers are lacking. So if you like browsers like Firefox but you want a browser to be generally quicker than Firefox, SeaMonkey is worth checking out.

Price: Free

Version reviewed: 2.15.2

Supported OS: Windows 2000/XP/Vista/7

Download size: 21.19MB

VirusTotal malware scan results: 0/41

Is it portable? Yes

SeaMonkey homepage

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  • Eric989

    @mukhi: I think that is one advantage of the portableapps platform is that if you do choose to install their suite as well, there is a way to update the apps from within the suite. I have never done that but that is my understanding.

  • mukhi

    @Eric989: yeh, i think portableapps is pretty good (their utorrent app is “portable” whereas portable utorrent available from the developer’s site is NOT).

    some folks may be concerned about “stealth” as for many portable apps, the answer is no.

    however, why should i want to use portable apps in my “own” computer when many portable apps are not as feature rich as the installed versions and do not allow windows integration unless you allow it? i want to because:
    # registry does not get bloated
    # if i ever reinstall OS, i don’t care about “reinstalling” external programs; i simply can use portable apps from a flash drive or internal HDD (copy/paste).

    however, there is a big caveat i find in many portable apps. many of them do not allow direct update (like what happens for firefox, jdownloader,…) if you want to. for example, if you want updated ccleaner, you go back to square one, i.e., you must redownload the zip file and extract again!

  • Eric989

    For the millionth time you do not need to install the portableapps platform suite to use their programs and their programs do not install. Their programs come in the form of an executable as this helps with compression, security and digital signatures, upgrading, drive letter changes, and licensing issues with some apps. The platform suite itself is completely optional but does provide a nice way to help launch, manage, and upgrade the apps if you want it. The platform can also do some pretty unique things like include portable fonts for your portable apps. Please refer to the following page for a full explanation of what they consider portable and the benefits of an executive over a zip archive.
    Please note their guidelines for their portable apps.
    A portable app works from any device (USB flash drive, portable hard drive, cloud drive, iPod, etc)
    A portable app works as you move computers and your drive letter changes
    A portable app is self-contained in a single directory with sub-directories and files within
    A portable app’s features continue working as you move computers
    A portable app doesn’t leave files or folders behind on the PC
    A portable app doesn’t leave registry entries behind except those automatically generated by Windows
    A portable app is optimized for use on removable drives
    A portable app doesn’t require additional software on the PC
    A portable app doesn’t interfere with software installed on the PC

    Of chief importance is self contained in a single directory and no registry entries. You can check this yourself with RegFromApp or RegShot or a similar program.
    Also note the first bullet describing what the executable actually does.
    Simple Portable Installer Wizard – The installer uses an easy-to-use, familiar wizard to handle the actual installation, guiding the user through the process. But unlike a standard software installer, it doesn’t overwhelm the user with choices, nor does it install to or make changes to the local PC.
    It does not install or make changes to the PC.
    If you absolutely wanted to you could run the executable in a sandbox or virtual machine and then zip the created folder to make your very own portable zip file if that makes you happy.

  • stilofilos

    @Rob (Down Under):

    Forget about that google dirt . I dropped it ages ago, and since then only use their Earth (yeah, the installed version again…).
    Did you ever try https://www.ixquick.com ?
    If you can not miss those google results, Ixquick has a sister-site called https://startpage.com where you use the google engine but with them acting as a proxy.
    Check out the ‘about’ link top right for more details
    and maybe also http://www.geek.com/articles/news/ixquick-offer-anonymous-web-browsing-with-new-startpage-proxy-20100129
    Enjoy !

  • Rob (Down Under)

    Whilst trying out SlimBoat, I came up against Google’s RECENT Safe Search CENSORSHIP, where they have sneakily introduced Safe Search filtering, and made it near impossible to turn off.
    The above is about Adult searches.
    The following is about general search results (NOT Adult searches)
    For for some time now, I have noticed that Google DELIBERATELY ignores attempts to limit their hits (results) to those containing specific terms, that we request. They are offering very time consuming courses, that we should not need, if their advanced Search page worked. AND IT DOESN’T.
    Is their any possibility of an article on the disintegrating/decaying Google Search Engine ?
    PS Here is a link to an article on the Adult problem, with many comments (including a couple of mine) –

  • Rob (Down Under)

    Thanks, that did the trick.
    I missed that. I have two excuses –
    1) I was inspecting another option ‘Home Page’, and I expected the option to be in there.
    2) I am old.

  • stilofilos

    @Rob (Down Under):

    For 1) check out menu tools – options – start up , there you can opt for the last open tabs and / or specified pages

    I had given up on NoScript long ago as i didn’t get to master it duely making an exception for my web banks – did like it otherwise.

  • Rob (Down Under)

    I am trying SlimBoat portable.
    I like it, but there will be one and a half Deal breakers.
    . . .
    1) It must be capable of restoring my open sites from my last session.
    I notice there is an option in the File menu, but I can’t remember to do that every time. And I am sure that I would resent having to do it all the time (even if I could remember to do it).
    . . .
    Half) I would like the NoScript capability. If I cannot get that, I could still use the browser, but I would then use it much less.

  • Rob (Down Under)

    Thanks for your support.
    Whilst awaiting an answer, I thought I would try out Martin’s(and your) suggestion.
    Funny that you just mentioned JavaScript, as I have just written to their General forum, asking if NoScript capability exists (I love NoScript)

  • stilofilos

    ( Helped myself to the solution of my annoyances… javascript , yeah… – Must believe I’m getting old )

  • stilofilos

    @Rob (Down Under): @Martin:
    I am eagerly waiting too for the link to that really portable version. The installer even appears not to be conform with standards, as UniExtract cannot even open it. If that is symptomatic for its overall quality…
    I also fully agree with your view on those suites, Rob. I started hating those portableapps things after their firefox did never stop creating hundreds of registry items, and as you cannot even launch more than one .kml/.kmz in their google earth… Totally fed up with such pseudo stuff.

    Thanks to Martin for his Slim Boat hint. I downloaded it, and it looks really nice so far. Clean, solid, user friendly – And Rob, fully and really portable !!!
    But I have two annoyances for which I did not find a solution yet : how to make it remember blocked elements ? plus I had to return to firefox to reply here as the boat does not let me… Little hint ? Thanks already.

  • mukhi

    one great feature that seamoney has is that it can change text font size without changing other things (say, pics). the only other browser that does the same is FF (AFAIK).

  • Rob (Down Under)

    As I mentioned I had come across links to the portableapps version, but they appear to need to be run from the portableapps suite. I don’t wish to have to do that.

  • red
  • Rob (Down Under)

    Since the author has not answered my question, do any others know how to get a standalone (no suite) portable version ?

  • AFPhys

    Thanks for that suggestion! I’ve always loved the combination that NetScape and SeaMonkey gave me. This may well enhance my toolkit.

  • AFPhys

    I beat you to this… About a week ago, I downloaded and installed SeaMonkey, very easily and successfully.

    My primary reason for getting it was for the “composer” HTML feature. It is a very simple editor/view tool and is very similar to the NetScape Composer, which I used for many pages many years ago. I recommend people try it.

    Since you claim it loads web pages quickly, I will be attempting to transfer my FireFox profile to SeaMonkey using MozBackup and the procedure described here: http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox soon. (N.B.@Martin: )

  • red

    You are wrong from the beginning. Firefox and Thunderbird share code with Seamonkey, not the other way… Seamonkey/Mozilla is much older than FF;) Cant import bookmarks? Cmon! Using Seamonkey since it was called Mozilla 1.0… import export… Gestures? No problem :] Just use last version Mouse Gestures Redox 20120202 http://minus.com/mQSlOBeEv/

    You want nice compact seamonkey? No problem- pinball theme -google it:]

    Modified Firefox extensions? http://xsidebar.mozdev.org/modifiedmisc.html or just ask http://forums.mozillazine.org/viewtopic.php?f=19&t=500361&start=1770 or new topic http://forums.mozillazine.org/viewtopic.php?f=19&t=2481107

  • Hi there,

    SeaMonkey can’t import my 1600 favorites from my other web browsers, I won’t use Ctrl-C/Ctrl-V to copy 1600 faves lol.

    By the way I found a very nice new browser, with a wide range of features and free. The name is SlimBoat, there’s a version for Windows, Mac and Linux and here is the website : http://www.slimboat.com/en

  • Rob (Down Under)

    I must confess that I don’t need the special features (HTML etc), however my ears pricked up when you said it is portable.
    The only download that I have found so far is a ‘setup’.
    Could you help me find the portable download ?
    PS I hate having to have a ‘shell’ program suite to launch my portable programs. My quick googling is seeing some downloads, but they all appear to be needing the portable apps suite. Can I avoid that ?