Mozilla has released the second beta for Firefox 4.0. This release is being made available for testing purposes only, and is intended as a preview release for web application developers and the testing community.

You can read more about this release on the Mozilla Blog, or at any of the following links:

• Read more about some of the major features in this beta
• Take a look at our big chart o’ technology that’s included in this beta
• Read the release notes for Firefox 4 Beta 2

Source: Mozilla Developers News