Firefox 4.0 is still being built for a better performance and there is loads of improvements coming for users. If you wish to experience it right-away, you can download the nightly updates from nightly.mozilla.org or you can use the following ppa. sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa ; sudo apt-get update ; sudo apt-get install firefox-4.0 firefox-4.0-gnome-support
Fix a “E: The method driver /usr/lib/apt/methods/http could not be found.” error
Following is an error encountered on Ubuntu 12.04 LTS $ sudo apt-get update E: The method driver /usr/lib/apt/methods/http could not be found. This can be easily fixed by installing apt-transport-https as follows. sudo apt-get install apt-transport-https
