Mozilla Firefox 21.0 Final

What's New in Mozilla Firefox 21.0 Final?

# NEW

   - The Social API now supports multiple providers

   - Enhanced three-state UI for Do Not Track (DNT)

   - Firefox will suggest how to improve your application startup time if needed

   - Preliminary implementation of Firefox Health Report

# CHANGED

   - Ability to restore removed thumbnails on New Tab Page

   - CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none

   - Graphics related performance improvements (bug 809821)

   - Removed E4X support from Spidermonkey

# DEVELOPER

   - Implemented Remote Profiling

   - Integrated add-on SDK loader and API libraries into Firefox

# HTML5

   - Added support for <main> element

   - Implemented scoped stylesheets

# FIXED

   - Some function keys may not work when pressed

   - Browsing and Download history clearing needs unification to avoid confusion on clearing download history

   - Security fixes

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