SeaMonkey 2.1 RC 2

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite (see below). Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept. Containing an Internet browser, email & newsgroup client with an included web feed reader, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

Under the hood, SeaMonkey uses much of the same Mozilla source code which powers such successful siblings as Firefox, Thunderbird, Camino, Sunbird and Miro. Legal backing is provided by the Mozilla Foundation.

SeaMonkey 2.1 contains the following major changes relative to SeaMonkey 2.0.14:

Sync (f.k.a. Weave) is now included directly in SeaMonkey. Sync allows you to keep your browsing history, passwords, bookmarks, preferences and tabs in sync across different devices (computers) in a secure way.
SeaMonkey windows can now be themed with Personas (lightweight themes).
The bookmarks system has been reworked to use the Places framework shared with Firefox (already used for history data in SeaMonkey 2.0), including a new Bookmark Manager and fast bookmarking button in the location bar.
Find in Page now works with a toolbar instead of a modal window.
OpenSearch plugins are now supported and the default for web search.
An optional search bar (including suggestions if the search engine supports it) is available in browser toolbar customization, and an engine manager for OpenSearch is available.
More toolbar widgets are now customizable.
The new Add-ons Manager opens directly in the browser now and has received a major facelift.
The new Data Manager now unifies cookie, permission, password, and form data management.
Flash cookies (LSOs) will now be removed when using Clear Private Data / Cookies (requires Flash Player 10.3 or better).
Plugin crashes do not take down the whole application anymore since plugins run in their own processes now.
Plugins now work in feeds shown in MailNews windows.
The feed preview UI and the Helper Applications preferences can now detect the system's default feed reader and use it.
Page zoom is being remembered on a site-specific basis now.
The browser tab bar is now scrollable to cope with tab overflow. This includes an "All Tabs" navigation button to quickly list all open tabs.
You can now drag and drop downloads, e.g. from the Download Manager to the desktop.
SeaMonkey now shows "doorhangers" for notifications like remembering log-in passwords or after installing an extension.
The new DoNotTrack HTTP header is supported (configurable in Preferences).
A page with Troubleshooting Information (about:support) and the option to restart in Safe Mode are now available from the Help menu.
Loading the URL about:memory now shows how much memory is used by different parts of SeaMonkey.
SeaMonkey should now support more websites that previously appeared to only work with Firefox (configurable in Preferences).
Built-in extensions (ChatZilla, JavaScript Debugger and DOM Inspector) are now installed into the profile.
News messages can now be deleted from local storage.
Cascaded Session Restore improves restoring large browsing sessions.
SeaMonkey now uses Omnijar which results in fewer installed files, less fragmentation and better startup time.