Why, you can't find pages on the web with fixed headers that behave as
expected in current FF versions? They're not rare.
I still don't understand the FF issue with Ed's page and your discussion.
just wanted to add this http://solutions.trendsmap.com/
that page uses a different speed for a background image in the middle
but yes, I heard recently complains about FF on linux ubuntu -
the scripts didn't work as expected after an update