Install - Linux
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Ubuntu
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`Firefox 4 PPA for Ubuntu 10.04 and 10.10 users`_:

::

  sudo add-apt-repository ppa:mozillateam/firefox-stable
  sudo apt-get update && sudo apt-get upgrade
  sudo apt-get install firefox ubufox


.. _`Firefox 4 PPA for Ubuntu 10.04 and 10.10 users`: http://www.omgubuntu.co.uk/2011/03/firefox-4-ppa-for-ubuntu-10-04-and-10-10-users/