Download
Firefox 4.0 for Windows
Firefox 4.0 for Linux (x86, x64)
Firefox 4.0 for Mac
Links
http://www.mozilla.com/firefox
http://en.wikipedia.org/wiki/Firefox_4
New UI (this can be changed if you don't like it)
Under the Hood
- WebM and HD Video
As pioneers of HTML5 video standards, Firefox also supports the WebM format so you can watch open HD quality video.
- Protecting Your Privacy
Firefox puts your privacy first, fixing flaws in some web standards that allow bad guys to snoop around and expose your browser history.
- New JS values
Changes to the C++ representation of JavaScript values allow Firefox to execute heavy, numeric code more efficiently, resulting in cleaner graphics and a better browsing experience.
- Multi-touch Support
Firefox now integrates multi-touch support for Windows 7, enabling you to interact with your browser in a whole new way.
- 3D on the Web
WebGL brings 3D graphics to Firefox, opening the door for developers to create vivid games and new kinds of visualizations and experiences for the Web.
- Audio API
Firefox is changing the way media is integrated on the web: exposing the raw audio data housed within the <video> and <audio> elements in HTML5 makes it easy for developers to use JS to read and write audio data.
- Retained layers
Experience super fast scrolling on complex web pages. Simply awesome.
- XPCOM
Firefox starts up even faster thanks to XPCOM module improvements that pave the way to a better extensions framework.
- Stylin Pages with CSS3
Support for new CSS3 features like Transitions and Transformations makes it easy to add elegant animations to Web pages. Learn more
- Fabulous Fonts
Firefox 4s OpenType font features gives designers and developers more control over a variety of font featureslike kerning or ligaturesto create gorgeous websites.
- Upgrading Forms
Firefox integrated Form features like list attributes and HTML5 validation provide the tools to make annoying form implementation development a thing of the past.
- HTML5 Support
A new HTML5 parser and full support for web video, audio, drag & drop, and file handling means Firefox 4 is ready to run the best web apps of both today and tomorrow.
- Web Console
With this experimental analysis tool for modern sites, Firefox allows you to peek under the hood of dynamic web pages.
- JetPack SDK (Making Add-on Development Easier)
Add-ons can be installed without restarting the browser, and can be developed more easily using the new JetPack SDK and js-ctypes.
- Full Hardware Acceleration
Experience super-fast graphics acceleration with Direct2D and Direct3D on Windows, XRender on Linux and OpenGL on Mac, now enabled by default, on all supported hardware.
- SVG as Images
SVG files can now be used as images and backgrounds in Firefox, meaning that developers and designers can have stunning, performance-conscious websites with lighter, resolution-independent image files.
- Compartments
Firefox can now better manage JavaScript objects with Compartments, offering improved cache utilization and garbage collection mechanisms for better security, memory management and overall performance.
- Crash Protection
Firefox provides uninterrupted browsing for Windows, Linux, and now Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins. If one of these commonly-used plugins crashes or freezes, it wont affect the rest of Firefox. Instead, you can simply reload the page to restart the plugin and try again. Learn more about plugins.
- HSTS
Sites can now keep attackers from intercepting sensitive data while accessing the site by telling Firefox to automatically establish secure connections to their servers (https).