The firefox 11 is released now. So the well is rolling again. How to install firefox 11 in ubuntu 11.10 or ubuntu 12.04 is the next question. It is easy. Just upgrade your firefox to the next version.
Ctrl + Alt + T will start the terminal.
sudo add-apt-repository ppa:ubuntu-mozilla-security/ppa
sudo apt-get update && sudo apt-get install firefox
That is all your firefox will be now firefox 11.
Firefox 11 features innovative visual layout tool called Tilt, a new live Style Editor, sync browser customisation and extensions, and more.