I'm (like Saab Dastard) still using FF2 but (unlike him!) it's due to my own limitations. I tried to update to FF3 some time ago and lost all of my bookmarks. I got them back by uninstalling FF3 and reinstalling FF2 from OldVersion.com whereupon my missing bookmarks were miraculously rediscovered. So why didn't the FF3 installation find them?
It was only about a couple of months ago that I was prompted to try to update once more with the specific assurance that my bookmarks wouldn't disappear this time - but they did so I had to revisit OldVersion.com! I'm sure that you will all now understand why I mentioned my limitations at the top!
Now YouTube says that I must update to FF3.6 but a certain sense of impending doom is gripping me and it's not made any better by the discussions here.