Canonical announced a few hours ago, April 4, that they updated the default web browser, Mozilla Firefox, to version 20, on all their supported Ubuntu operating systems.
The good news is that Mozilla Firefox 20 is now available for all supported Ubuntu platforms, including Ubuntu 12.10 (Quantal Quetzal), Ubuntu 12.04 LTS (Precise Pangolin), Ubuntu 11.10 (Oneiric Ocelot) and Ubuntu 10.04 LTS (Lucid Lynx).
All users are urged to upgrade to the new Firefox version as soon as possible, using the built-in Update Manager tool.
You can download Mozilla Firefox 20 with both binaries and sources for any Linux distribution from Softpedia. Also, don't forget to visit our always up-to-date Firefox Extensions section for the latest add-ons.