Mozilla has come out with second beta of the Firefox 4.0 web browser and has since then has occupied the top slot on news.

The new interface and improvements includes tabs-on-the-top placement for the Mac OS X users at the same time adds the "App Tabs" to keep a close eye on most commonly used web apps and services.

It is soon after the launch of Firefox 4.0 beta 1, the new beta version rolls out offering a facelift to Mac users who might have been wishing for this offering.

In addition to this users of Windows 7 and Windows Vista get to have a single Firefox button just like the one found on Opera.

Meanwhile the interesting trait that was brought on focus was Firefox 4.0 beta 2 Apps Tab that is present on the left side of the browser permanently which means, one can attach their Gmail, Google Apps, Twitter, Facebook or any other service out there.

This move is taken in lieu of renouncing its position even firmer in the market.