Mozilla ha annunciato il rilascio di Firefox 4, la versione finale arriva dopo il rilascio di 12 versioni beta e due release candidate.

Mozilla, a global, nonprofit organization dedicated to making the Web better, is proud to release Mozilla Firefox 4, the newest version of the popular, free and open source Web browser.

Secondo Mozilla la versione 4 è la versione più veloce di Firefox, Firefox 4 è da due a sei volte più veloce di Firefox 3.
Firefox 4 è dotato anche di un nuovo add-ons manager, supporto per HTML5, App Tabs. Il motore JavaScript incorpora il nuovo compilatore JägerMonkey JIT. Con Firefox 4 un eventuale problema con Adobe Flash, Apple QuickTime o Silverlight di Microsoft non causerà il blocco del browser. Se uno di questi plugin si dovesse bloccare non influenzerebbe il resto di Firefox, sarà sufficiente ricaricare la pagina per riavviare il plugin.
Firefox 4 è disponibile in oltre 80 lingue per sistemi Windows, Linux, Max OS X. Il download è possibile da questa pagina.

What’s New in Firefox 4:

Fastest Firefox Ever

• Performance: Firefox is up to six times faster than the previous release. With improved start-up and page load times, speedy Web app performance and hardware accelerated graphics, Firefox is optimized for rich, interactive websites.

Streamlined Interface

• App Tabs: give a permanent home to frequently visited sites like Web mail, Twitter, Pandora, Flickr.
• Switch to Tab: easily find and switch to any open tab from your Awesome Bar without opening duplicate tabs.
• Panorama: drag and drop tabs into manageable groups to save time while navigating many open tabs.

Private and Secure Synchronization

• Firefox Sync: access your Awesome Bar history, bookmarks, open tabs, passwords and form data across multiple computers and mobile devices.

Most Customizable

• New Add-ons Manager: easily discover and install more than 200,000 add-ons to customize the features, functionality and look of Firefox.

Private and Secure

• Do Not Track: Firefox is leading the Web towards a universal standard Do Not Track feature that allows users to opt-out of tracking used for behavioral advertising.
• Firefox puts privacy first, fixing flaws in some Web standards to prevent others from accessing your browser history.
• HTTP Strict Transport Security (HSTS): automatically establishes secure connections to stop "man in the middle" attacks and keep sensitive data safe from interception during the log-in process.
• Content Security Policy (CSP): prevent cross-scripting attacks by allowing sites to explicitly tell the browser which content is legitimate.

Cutting Edge Tools for Web Developers:

• The JavaScript engine incorporates the new JägerMonkey JIT compiler, along with enhancements to the existing TraceMonkey JIT and SpiderMonkey’s interpreter for faster page-load speed and better performance of Web apps and games.
• HTML5 support in Firefox includes hardware accelerated, high-definition video (WebM), 3D graphics, offline data storage, professional typography, touchscreen interfaces and the Mozilla Audio API to help create visual experiences for sound and more.
• Firefox 4 also improves existing tools like CSS, Canvas and SVG to enable developers to make exciting Web pages.
• Firefox provides uninterrupted browsing when there is a crash in the Adobe Flash, Apple QuickTime or Microsoft Silverlight plugins. If one of these plugins crashes or freezes, it won’t affect the rest of Firefox. Simply reload the page to restart the plugin.

Opera ha rilasciato la nuova versione del suo browser per dispositivi mobili Opera Mobile 11 per sistemi Android e Symbian.

Big day at the Opera! We are launching Opera Mobile 11 for Android and Symbian/S60. Download now direct to your device from  m.opera.com, or get it in the Android Market.

Features

• Modernized new user interface
• New UI optimized for tablet devices
• Faster framerates when panning and zooming
• No checkerboard, ever
• Text stays sharp during zooming
• Improved text-wrap on zoom
• Smart-tap, auto-zoom and highlights links if ambiguous link click
• Incremental zooming for devices w/o multi-touch
• Buttons for jumping to the top/bottom of the page
• Haptic feedback (if supported in hardware)
• Share URL on social networks, email etc
• Improved Geolocation support
• Session restore

Rendering

• Presto 2.7.81
• JIT for greatly improved Javascript performance (was supported in 10.1 on some Symbian devices)
• Adobe Flash support (Android only, Flash player available separately in Android Market)
• Click-to-play, load Flash content on demand only
• Application Cache
• WebStorage and WebDatabase
• DOM touch and multi-touch events
• HTML5 Audio/Video
• Support for CSS @viewport
• Improved support for meta viewport
• Support for Web Open Font Format (WOFF)
• Support for Arabic ligatures
• Improved form fields skin

Apple ha rilasciato iOS 4.3, nuova versione del sistema operativo per iPhone, iPod e iPad.

New features in iOS 4.3 include faster Safari mobile browsing performance with the Nitro JavaScript engine; iTunes Home Sharing; enhancements to AirPlay; the choice of using the iPad side switch to either lock the screen rotation or mute the audio; and the Personal Hotspot feature for sharing an iPhone 4 cellular data connection over Wi-Fi.

Soddisfatto il commento di Steve Jobs

"With more than 160 million iOS devices worldwide, including over 100 million iPhones, the growth of the iOS platform has been unprecedented. iOS 4.3 adds even more features to the world’s most advanced mobile operating system, across three blockbuster devices—iPad, iPhone and iPod touch—providing an ecosystem that offers customers an incredibly rich experience and developers unlimited opportunities."

Per quanto riguarda i cambiamenti introdotti il motore Nitro Javascript è stato integrato in WebKit, il layout engine di Safari.  Introdotti miglioramenti per Airplay, l'innovativa tecnologia wireless che consente agli utenti di trasmettere musica, foto e video per Apple TV. Con iOS 4.3 è possibile lo streaming di contenuti aggiuntivi, tra cui video da applicazioni di terze parti e siti web.
Il nuovo iTunes Home Sharing consente agli utenti di riprodurre musica, film e programmi TV su un iPhone, un iPad o un iPod touch, dalla propria libreria iTunes anche su un Mac o PC in una rete locale Wi-Fi.
Più di 10 miliardi di applicazioni sono state scaricate dall'App Store, e oltre 350.000 applicazioni sono disponibili, tra cui più di 65.000 applicazioni native iPad, per i consumatori di 90 paesi.
iOS 4.3 sarà disponibile per gli utenti iPad, iPhone e iPod touch come aggiornamento software gratuito a partire da venerdì 11 marzo. iOS 4.3 è compatibile con iPad, iPad 2, iPhone 3G, iPhone 4 (GSM model).