We are not sure whether you are keeping track of all the releases made by Mozilla regarding Firefox 4. The latest beta was launched recently on September 7th. Beta 5 now comes with even more features. Now hardware acceleration is switched “on” by default while there is also the addition of HTML 5 Audio Data API. Another important feature that has been added called the HTTP Strict Transport Security (HSTS), allows any website to enforce SSL-encrypted connections.

Here’s a quick recap of all the changes to be found in Firefox 4 beta 5:

• Firefox 4 Beta 5 is available in 39 languages.
• Support for the new proposed Audio Data API
• Direct2D Hardware Acceleration is now on by default for Windows 7 users
• Firefox button has a new look for Windows Vista and Windows 7 users
• Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL.
• See the complete changelist from the previous beta.

[source: mozilla.com]