*Web Technologies*

   - Web Sockets - Bidirectionally connected apps
   - PushState - Better Ajax-y interactions
   - Content creation - HTML5 forms, contentEditable (early stages)
   - IndexedDB - Structured data storage (early stages)


*Multimedia*

   - Direct2D hardware acceleration
   - Aero Peek integration
   - Graphics compositing with Layers
   - WebGL (early stages)
   - OSX integration (early stages)
   - Standards for contacts, cameras, and microphones (early stages)

*Performance*

   - JagerMonkey (high-performance when tracing isn't viable)
   - HTML5 parser off main thread
   - Startup timeline optimizations
   - Reduced I/O operations on main thread
   - JavaScript threads and GC
   - DOM performance improvements
   - Layers for compostiting, scrolling


*Security*

   - CSP (allowing secure pages)
   - :visited fix (privacy)
   - ForceTLS (authenticated login)
   - CritSmash
   - Early Security Reviews

*Developer tools*

   - New profile manager
   - Enhanced Firebug compatibility
   - Remote JS Debugger
   - Web Consoler
   - Web Inspector
   - Timer API (early stages)
   - Memory diagnostic tools (early stages)


http://css.dzone.com/articles/firefox-4-it-win-it

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