Give it some time people. As Mind has already mention the new forum was released prematurely.
For those of you still using firefox 2. Perhaps you should consider downloading firefox 3 beta 1 release
Until then, please be patient
Most probably Firefox 3 doesn't play well with the current version of Thunderbird and extensions/add-ins don't work. That's been my experience jumping ahead in the past.
I just told Mind my problems with the new format that websites are adopting. I had a Hell of a time trying to find his note to me and my response to him in the Preview because the print is all less bold than it used to be and everything except the controls are some shade of blue. It's a perceptual chore to find and separate out this piece of text from another piece when they are all pretty much the same font and you have to spot the text in various shades of blue.
This new format is used by a number of forum sites I belong to. Each of the sites suffered a massive falloff in participation.
It's not that people can't adjust to new things. Some new things are not just as good as the former way.
I am usually full of life in the afternoon, but since I've been viewing this site I've been getting sleepy looking at this very soothing, almost mind shutting down pastel site. I'm going off to drink the first cup of coffee I had in the afternoon in many, many months.