Firefox displays design narrower then Chrome & IE

This is the weirdest thing! For some reason, despite showing up correctly at 950 pixels in Chrome and IE, FireFox is displaying https://www.danieljosephcellars.com/WineClub/Join.htm at 850 pixels (I've checked it on several computers) and I can't figure out why!!?? (I don't know if this has anything to do with it, but it used to be 850 pixels and I widened it to 950)

I've gone through the page code and CSS with a fine tooth comb and it all seems to check out -- does anyone have any ideas what the problem is and how to fix it? The CSS is at https://www.danieljosephcellars.com/main.css

TIA!!!

It's okay in my FF5!

are you viewing a cached page? your "it used to be 850px..." tells me that it is probably retaining an old value. clear cache and check it.

are you viewing a cached page? your "it used to be 850px..." tells me that it is probably retaining an old value. clear cache and check it.

Going off of alykins comment, CTRL + SHIFT + DEL(ETE) will show you the option to reset/clear cache option on most browsers. If you did not know :)

Checking through my browsers they appear fine on all of them. (FF3.6).

I can't believe I made such a newbie mistake! Thank you so much for checking this out (as stupid as it makes me look, at least there is nothing to fix -- except my cache!) :)