Firefox 1.0

I dowloaded Firefox 1.0 at home yesterday. The only thing from going from 0.8 to 1.0 is I lost an extension and I can't find it for 1.0. I had an extension that remembered all the tabs I had opened so when I relaunched Firefox all the tabs were still there. Now it only has the homepage open. The funny thing is I had this same extension for 0.9 at work, and it kept it so I have it at work, but now can't find it at all. Weird.