monkey - the Mozilla fanboys would claim Foxfire was doing it right if it turned your yellow squares into pictures of Hillary Clinton's bum.

This is one of the big pains using FF, you just have to set ".clear: clear: both;" in any stylesheet and be ready to use it. The FF trick I really love is when the containing div turns 1px high and pops up to the very top of the page. appears above the main containter.

IE6 has plenty of problems and theoretically a lot more individual instances of non=compliance with w3c, but as a practical matter IE is just as easy to code for.

The one big advantage writing css for FF is, IMO, an add-on called Aardvark.