Hi,
Quick panicky post.
A few of us have noticed that the 0.9 version of Firefox seems to have a few glitches with it (weird bookmark behaviors, extensions that refuse to die or even appear, etc.) i'd recommend holding off doing an upgrade for a while.
Apparently, there's an upgrade FAQ. Follow it.
Obviously, with the verision 1.0 release, you can, should, and probably must upgrade. C'mon, it's cooler than 0°K.


