Firefox 4.0 Beta 4

Firefox have just released the beta 4 of their upcoming Firefox 4.0 and they have introduced a brand new feature called Firefox Sync which automatically syncs all your passwords, bookmarks, and other personal data between your computers. you only need to create an account and firefox does the rest automagically.

Here are the complete release notes
                

• Firefox 4 Beta 4 is available in 39 languages.
• Firefox Sync is now included by default.
• A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped.
• An experimental API is included to provide more efficient Javascript animations.
• Firefox now supports the HTML5 video "buffered" property.
• See the complete changelist from the previous beta.

Other features of Firefox 4.0 include making a web app into an app tab to decrease the clutter of tabs and seamless integration with windows 7 and aero.
download here:  http://www.mozilla.com/en-US/firefox/beta/