Thanks to MozBackup, my Firefox installation on the new computer looks pretty much like the old one - saved passwords, address history, even the extensions! Awesome.
I wish Opera had something like that (or if there is - how?)
Annoying to have to configure your font choices again. The skin also looks icky, I think. And I'm a bit annoyed that 10.50 (I had 10.20 on the previous box) doesn't seem to let you minimise tabs any more! That was really handy when I had a bunch of tabs open and I wanted to read one later; I'd minimise it and could then continue reading the next one, and when I was done with the maximised ones, I could go through the ones I had minimised previously. Meh.