SeaMonkey 2.1

What's new in this version:

- 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