I use Linux at work and do web development that should support Internet Explorer 6 (and later) and Firefox 2 (and later).
IE4Linux is actually not good enough to test Internet browser browser rendering properly, as it does not work exactly like Internet Explorer does in Windows. You can use something like browsershots , but I would recommend running Windows in a virtual machine and testing using this to test Internet Explorer. I did this for a while, and it works great if you have 512 MB of backup RAM for Windows and XP.
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