SeaMonkey/Features/2.1

What big things do SeaMonkey 2.1 builds offer (over SeaMonkey 2.0)?

Nightly

• ...

(Almost) Ready, but not in yet

Please provide explanations for all items here.

• bug 576970 Include Sync in SeaMonkey: Waiting for reviews

Beta 1

• OpenSearch plugins are now supported and the default for web search. (bug 410613)
• Data Manager now unifies cookie, permission, password, and form data management. (bug 569341)
• Plugins now run in their own processes and don't take down the browser any more if they crash. (bug 545716)
• The context menu of the location bar now has a "Paste and Go" option. (bug 599833)
• The location bar now features a fast bookmarking button. (bug 589601)
• SeaMonkey now builds most of the application into a single library ("libxul"). (bug 394502)
• JavaScript is faster than ever with the new JägerMonkey engine.
• Direct2D Hardware Acceleration is now on by default for Windows 7 users, hardware accelerated layers are available on all platforms with know-to-work video drivers.
• XUL in web pages is not allowed any more. (bug 546857)
• The proposed Audio Data API is available.
• The HSTS security protocol is available
• Absolute length units in CSS are not physical, but relative to CSS pixels now (on the basis of 96dpi). (bug 537890).

Alpha 3

• The bookmarks system has been reworked to use the Places framework shared with Firefox (bug 498596), which will allow enabling Bookmarks with the Sync add-on (bug 585845).
• Several methods of the Firefox TabBrowser API (bug 558614, bug 558673, bug 579845) were implemented in SeaMonkey, which will allow to enable Tabs with the Sync add-on (bug 567583).
• The tab bar received a visual refresh. (bug 579732)
• Gopher support has been removed. (bug 572389)
• Web developers can animate content using CSS Transitions.
• SeaMonkey now defaults to tabbed browsing instead of opening new windows. (bug 505311)
• Address book toolbars can now be customized. (bug 575956)
• Find in Page now works with a toolbar instead of a modal window. (bug 97023)
• The browser can now be themed with Personas (lightweight themes). (bug 563261)
• The upcoming Gecko release has been renamed from 1.9.3 to 2.0. (bug 570022)
• The User-Agent (UA) string now exposes less information. (bug 572668: Crypto token, bug 572656: UI language, bug 581783: "Windows;")
• The Add-on Manager now shows add-on Preferences buttons (bug 562890) and versions (bug 562052) directly in the list and searches AMO now (bug 558287).
• SeaMonkey now supports the HTML5 video "buffered" property.* XPCOM registration has been changed. (bug 568691)
• Archiving can now keep the folder structure intact (no configuration UI yet). (bug 573392)
• The W3C Indexed Database API is now available to websites. (bug 553412)

Alpha 2

• New Add-ons manager (bug 561600)
• Drag URL/file to/from SeaMonkey's Download Manager (copy/move to desktop/folder) (bug 192728)
• Save multiple messages as individual files in directory (bug 555972)
• Make Search, Folder Location and Views widgets for MailNews customizable toolbars (bug 521927)
• WebM video is now supported for HTML5 <video> tag. (bug 566245)
• View source is now consistently taken from the platform and appearing in a SeaMonkey look and feel across all invocations. (bug 411754)
• Loading the URL about:memory now shows how much memory is used by different parts of SeaMonkey.
• SeaMonkey now supports a lot of the same tabbrowser API as Firefox. (bug 467867)
• Search and Go buttons widgets for Browser are now customizable. (bug 529647)
• The feed preview UI and the Helper Applications preferences can now detect the system's default feed reader and use it. (bug 471346)
• HTML5 Websockets are now available to website authors. (bug 472529)

Alpha 1

FF 3.6 and DevPreview relnotes provide some info.

• WOFF format for website fonts (bug 507970).
• Resizeable text areas in web forms (bug 442228).
• Fullscreen video (bug 453063).
• JIT tracing for x86_64 (bug 489146).
• async places history expiration.
• Expiration and frecency-ordered form field autocomplete.
• Improved js-ctypes support.
• Better performance on startup and shutdown.
• SVG attributes which are mapped to CSS properties can now be animated using SMIL (bug 534028). Support for SMIL Animation in SVG.
• Core Animation rendering model for plugins on Mac OS X has been implemented. Plugins which also support this rendering model can now draw faster and more efficiently.
• Support for new CSS attributes such as gradients, background sizing, and pointer events.
• Support for new DOM and HTML5 specifications including the Drag & Drop API and the File API, which allow for more interactive web pages. (bug 500328, bug 457800, bug 356295, bug 523771, bug 503943, bug 396392, and more)
• Protection from out-of-date plugins
• CSS :visited selectors have been changed to block ways that websites can quickly check a user's browsing history.
• The SSL security system has been changed to fix a renegotiation flaw.
• Support for CSS Transitions.
• Support for WebGL, for Direct2D acceleration on Windows (all disabled by default).
• A new HTML5 parser.
• New Troubleshooting Information page (about:support, bug 545110).
• Notification bars for MailNews return receipts (MDN, bug 539066)
• Support for libnotify-based Desktop Notifications on Linux (e.g. mail alerts, finished downloads)
• Support for using system proxy settings on Windows (bug 485764).