Re Firefox 3.6
I initially had some probs, again on an an Acer One - Running Ubuntu 9.10 - The screen kept darkening; as if the application was "Busy" and not under control of the O/S - There then followed an update from Canocial, about three days ago and all's well since. Use your Linux system update options to see if there's an operating system update waiting in the wings. I'm sorry that I do not know about anything other than Ubuntu.
CAT III