Forum Moderators: open
Please note as per our TOS that we prefer to keep actual sites off the board here and talk generics rather than specifics.
What we really need is a verbal description of the problem.
Cross-browser compatability is a big topic of discussion and this thread might be better off in the browsers forum so I'll move it over.
TJ
W3C Validator - HTML [validator.w3.org]
W3C Validator - CSS [jigsaw.w3.org]
You can check the MIME-type of your "/" page by viewing Tools->Page Information in Firefox. It should be "text/html".
It sounds like the MIME-type for filetype ".html" is overridding the default, but since "/" has no filetype, this override won't happen, and the default the MIME-type is wrong.
Jim