Firefox 4 Beta 2 Released, App Tabs Included

28 Lug/10

Mozilla has released Firefox 4 Beta 2 yesterday, a new beta version of the upcoming Firefox 4 web browser. The new version can be downloaded from the release notes or official beta download page. It is as usual available for all supported operating systems (Linux, Mac, Windows) and languages.

The “big” new feature in Firefox 4 Beta 2 is App Tabs, which resembles Google Chrome’s Pin Tab feature. Every tab in Firefox has a new option on right-click to convert it into an App Tab. Those tabs are reduced to their Favicon and placed on the leftmost side of the tabbar.

firefox app tabs

firefox app tabs

Mozilla developers have created a short video to demonstrate the new App Tab feature

A new page loading animation has been added as well, the favicon of sites in the tabbar is replaced with a loading animation, which switches back to the website’s favicon once the page has loaded fully.

page loading

page loading

The release notes contain additional changes and feature descriptions, including:

  • Tabs are now on top by default on Windows and OSX – Linux will be changing when the theme has been modified to support the change.
  • Responsiveness and scrolling improvements from the new retained layers layout system.
  • JavaScript speed improvements due to engine optimizations.
  • You can search for and switch to already open tabs in the Smart Location Bar
  • The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you’d like).
  • Full WebGL support is included but disabled by default at this time
  • Native support for the HD HTML5 WebM video format.
  • An experimental Direct2D rendering backend is available on Windows, turned off by default.
  • More responsive page rendering using lazy frame construction.
  • Link history lookup is done asynchronously to provide better responsiveness during pageload.
  • CSS :visited selectors have been changed to block websites from being able to check a user’s browsing history.
  • New HTML5 parser, Support for more HTML5 form controls.

Firefox 4 Beta 2 reaches the same score in the HTML5 browser test as the last beta. The browser scores 97 of 100 points in the Acid3 test, but drops 200 points in the Peacekeeper benchmark when compared to the performance of Beta 1.

© Martin for gHacks Technology News, 2010. | Permalink | Add to, digg, facebook, reddit, <a href=" 4 Beta 2 Released, App Tabs Includedstumbleupon, twitter
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