rocknbil - 4:57 pm on May 26, 2011 (gmt 0)
Define oversized. Layout too big or just elements too big? (fonts, etc.)
Validated the output of course?
Got some **basic** CSS/HTML to share?
If it's the entire "page" going too big I'd say something is goofy with your FF install and it may be stuck in a zoom state.