In FF 3.0x there's a known problem with floats which appears when you try to design an element floated to the right with the simple code like this:
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It positions not as a normal float, but jumps up for about 1.3em, so you need to specifically address the issue by adding the negative margin ("margin-top:-1.3em").This bug is already corrected in Firefox 3.1, but until it's out and to maintain compatibility with older versions, you should follow this recommendation: always place elements floated to the right before the code it's going to float, not after, and you don't need any additional rules, things get normal.
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