I would highly recommend checking the plugin list before upgrading. Some plugins are not compatible, and it would stink if you lost functionality that is important to you with the upgrade. You can check the plugins here:
When I had to upgrade my realplayer last night, it dl firefox for me. Not sure if its the new one or not, Ill have to check when I get home.
"I, not events, have the power to make me happy or unhappy today. I can choose which it shall be. Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, today, and I'm going to be happy in it. "Groucho Marx