The Ubuntu's default web browser, Mozilla Firefox, hits 15th version. There are many changes and improvements in this release.

Below are some new features, changes, and improvements of Mozilla Firefox 15:
  • Silent/background updates
  • Support for SPDY networking protocol v3
  • WebGL enhancements, including compressed textures for better performance
  • Optimized memory usage for add-ons
  • HTML5: The audio and video elements now support the played attribute
For complete list of changes of this release please click here.

Install Mozilla Firefox 15 on Ubuntu
It should be installed when you run a system update, simply execute the following command to do that:
  • sudo apt-get update
  • sudo apt-get dist-upgrade
Enjoy the latest version of Firefox :)