Whatever you prefer.

Karl

It depends on the target you will gonna be working on.

I mean, for example, I have an application (intranet) that I know for a fact
that the users will gonna use only IE6+ so I don't pay attention to any
other.
In the other hand I have some sites that many people access using Firefox,
so I test how they work in Firefox too...

Personally, I like to use Firefox with the HtmlTidy extension installed.
Makes it *real* easy to verify that the html is correct.  (And I also view
the pages in IE just to make sure they look OK there too.)

--Rob Roberts

I use IE7 and Firefox, but i would definately check IE6 since most
people don't have IE7 yet.  Here's the way I look at it.  IE6 is
dominant, so you need to check it with that.  Firefox is mostly
(completely?) standards compliant, so all mozilla foundation and i
think opera will look the same.

For konquerer and such... well... i'm sure it will be browsable, i
won't take the time to test.

-Darren Kopp
http://blog.secudocs.com/