I have no problem with the friends stuff, although it's a little slow and laggy. Netflix in general seems to favor IE more (yech) - you can only watch instant with that browser, etc.
I gave in and downgraded to Firefox 2. (It took 1 hour to do this, including fixing all my addons, cookies, forms, and passwords.) Now, everything is working great.
I'll wait until Firefox 3 is officially released before upgrading.