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But it depends on what FP features you use. It's possible to use the WYSIWYG features of FP without substitutes etc. But FP still throws in funny code. It'll do strange things to your tags, forget to close some, use other gimmicks that work only in IE etc. For crying out loud I only recently discovered that while everybody else was using "ISO-8859-1" for "content type" my FP pages had "Windows 1252" i.e. if the visitor is not using Windows he should really "upgrade" to a Windows OS ;)
If you're using FP check and double check your pages in a variety of browsers and on different platforms.