At work, I recently upgraded Firefox from 1.0.8 to 1.5, and it went pretty smoothly—recognised all my extensions, my saved passwords, my bookmarks, etc.
At home, I still had 0.8 running. This morning, Gmail started hanging on me and I thought this might be a sign to upgrade. Download, install, run—oops, looks as if it's never heard of my previous installation. Bummer.
So I guess I'll be copying over settings and bookmarks over the weekend, as well as installing extensions and perhaps visiting a few sites I go to regularly so that it'll pick up the passwords and cookies.
On the other hand, this might be a good time to start afresh. Does anyone have any favourite Firefox extensions they can recommend to me? What's their name, what do they do, where do you get them from?