Projects / SeaMonkey


The SeaMonkey project is a community effort to develop an all-in-one Internet application suite. It contains an Internet browser, email and newsgroup client with an included Web feed reader, HTML editor, IRC chat, and Web development tools, and is sure to appeal to advanced users, Web developers, and corporate users. It uses much of the Mozilla source code powering such successful siblings as Firefox, Thunderbird, Camino, Sunbird, and Miro.

Operating Systems

Recent releases

  •  11 Jun 2014 08:55

    Release Notes: New features include a Gamepad API, CSS3 variables, Promises, "number" and "color" input fields in HTML forms, and the option not to strip signatures when replying to messages. There were also several fixes to stability issues.

    •  24 Mar 2014 08:36

      Release Notes: In this release, newsgroup names can now be entered using autocompletion. The Gamepad API has been finalized and enabled, and VP9, Opus, and HTML5 volume control are now implemented. There are various new features to HTML forms and MathML, and several stability issues have been fixed.

      •  05 Feb 2014 07:57

        Release Notes: There is now support for Atom Threading Extensions, better support for migrating profiles from Thunderbird, and several improvements to the autocomplete and mail/news user interfaces. TLS 1.1 and TLS 1.2 are enabled by default, and support for the SPDY 3.1 has been added. Besides this, there are several other new features, stability fixes, and security fixes.

        •  16 Dec 2013 08:40

          Release Notes: All plugins are now defaulted to click-to-play. Page load times have been improved. Support for H.264 on Linux, and support for MP3 on Windows XP. The password manager supports script-generated password fields. Download progress is now shown in the Mac OS X app dock icon. EXIF orientation is now being used when displaying attached images in MailNews. MailNews notifications have a new look. Plus several bugfixes and improvements to stability and standards compliance.

          •  04 Nov 2013 08:19

            Release Notes: This release adds Web Audio and CSS3 background-attachment:local support, many new ES6 functions, and a "Validate this page" command. iframe content can now be specified inline. Sorting messages by date can now be configured to look at the thread root. Plugins doorhangers now allow activating different plugin types independently. The proxy popup is now also available from the MailNews main window. A new Recipients column has been added which shows all recipients. The default HTML5 A/V player can change the playback rate. The Firefox devtools debugger can now be used to debug SeaMonkey remotely.

            Recent comments

            15 Jul 2004 18:43 dgtlmoon

            Two years on and still some serious printing issues
            I tried using mozilla to replace an office I became an admin for who were running InternetExplorer, however a lot of the desktops have gone back to using InternetExplorer because most web-sites just do not print correctly.

            Click here to view the bug in bugzilla

            I understand this bug has been open for just over two years, whats been going on? How can we find the people to fix the serious bugs that are stopping Mozilla from being "taken seriously", I tried posting this to slashdot but it seems like the opensource geeks just dont want to know about it and my article never made it to the site.

            What does this say about the opensource community? they probably dont give a sh*t ? Maybe they should stop touting mozilla as the best thing since sliced bread.


            25 Oct 2003 10:19 accurate

            Just compiled Mozilla 1.5
            I'd just like to say I think Mozilla is the best. People should use it on any system. I'm glad they added the Popup blocker in 1.4, and the spell check in 1.5 for composer, also it seems that 1.5 may be a little faster too. Great software!

            06 Sep 2003 01:31 xb0ne

            The Best Browser & Mail Client Ever!
            Mozilla is Best Browser & Mail Client Ever!. Other software can 't beat it! Keep up working on it, because it rocks! ;-)

            01 Jul 2003 04:59 gvy

            Mozilla mirror in Ukraine
            Just in case -- we have mozilla-1.x release binaries built by ( and ( ( mirrored at ( (which is Ukraine-only, but very fast here), and Ukrainian lang pack from ( is mirrored when available too.

            06 May 2003 14:44 charlesbarr

            PDF Conversions

            Why don't you add a webpage to pdf conversion into Mozilla? I have one which I will donate to the project if the tesm wants it. To see an example of how it works, look at and convert a webpage.



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