I;ve been trying to get back to normal since my upgrade to Firefox 1.5. Most of my extensions have been updated properly, except a few I really wanted. then I found this info:

In the address bar, typ about:config and hit Enter. Now, right-click on the list, and select New -> String, then type app.extensions.version for the name and 1.0 for the value. Enable the extensions and restart Firefox and you’re ready to go!

Thanks liewCF! http://www.liewcf.com/blog/archives/2005/09/make-old-extensions-work-in-firefox-15/