Were you previously using Firefox 3.6 or Firefox 4 with this site?

I was using 4.0

We are just now starting to understand the changes from Firefox 4 to Firefox 5, so I don't have any specific suggestions if it worked in 4.

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

1. Clear Firefox's Cache

orange Firefox button or Tools menu > Tools > Options > Advanced

On the Advanced tab: Network sub-tab > Offline Storage: "Clear Now"

2. If needed, delete the site's cookies here

While viewing the page, right-click and choose View Page Info > Security tab > "View Cookies"

Does that help at all?

No. There was 17 MB of stuff that I dumped. I can start a new site and go all the way to publishing it, but when I go back to edit, I can not do that. Know somewhere else that host web sites?

The are innumerable web hosting services, but finding one with a publishing system you like equally well can be a challenge. You might want to submit a support request to your current host, and if necessary, use IE to make edits until there is a solution.