Looks like a problem with incompatible JavaScript code that doesn't work in Firefox.

Error: ds is undefined
Source File: http://www.spirit.com/script/hotelAndVacationSearch.js
Line: 6

var ds = document["SkySales"];

This problem is on my home and work machine. Is there something I can change? Can I downgrade to the older version of Firefox (sites working are more important to me than the new features of 4.0). Should I just use IE for this site (I usually don't use IE)?

Also had a problem with BabiesRUS for baby shower, the link to confirm the order wasn't working in Firefox (it appeared the site was broken, but it was actually something with Firefox only), but it worked in IE. A couple years ago or more I had such problems with Firefox, but it seems sites become dually compatible with IE and Firefox, it's peculiar that 4.0 is having these problems again...

They do work today for me in Firefox 4, so you can try again.

Reload the web page and bypass the cache with:

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

Reloading the Spirit web page and bypassing the cache worked! You made me very happy, I much prefer Firefox and I also needed Spirit.

I used this method and it worked great: Press and hold Shift and left-click the Reload button.

You're welcome