Firefox 4 has been released one month ago making its users happy. Mozilla developers did a very good job catching up with competitors speed and UI wise. But it seems that all those attractive bright features had stolen Mozilla developers’ attention from what the real Firefox advantage once used to be (at least for us – developers) – its Firebug extension. Firefox 4 was released with a bug in it. Basically the bug makes it impossible to use Firebug with Firefox 4 to develop Dojo applications. At all. From discussion in the bug report it seems that Firefox 4 will never get fixed and JavaScript developers have to choose between using Firefox 3.6 (slow and clumsy) and switching to another browser until Firefox 5 becomes available. Let me ask you a very good question – will they ever switch back? This situation could seem surreal, but things get more clear with three facts in mind: Firefox is IBM’s default browser, Firebug is sponsored by IBM, and Dojo is IBM’s primary JavaScript platform. Software Development