I am unable to reproduce this here. Can you please give us the output of "apt-cache policy firefox" and "lsb_release -a" so we have a better understanding of what ubuntu and firefox you are using. Does this happen if you run firefox in terminal with "firefox --safe-mode" are you able to reproduce this than?
Which flash package do you have installed?
Which Java package do you have installed?
Which firefox extensions do you have installed?
I am unable to reproduce this here. Can you please give us the output of "apt-cache policy firefox" and "lsb_release -a" so we have a better understanding of what ubuntu and firefox you are using. Does this happen if you run firefox in terminal with "firefox --safe-mode" are you able to reproduce this than?
Which flash package do you have installed?
Which Java package do you have installed?
Which firefox extensions do you have installed?