Mozilla Firefox 9.0 stable has just released few hours ago. The new release brings Type Inference which significantly improves JavaScript performance.

Firefox 9.0 has the following changes:

  • Added Type Inference, significantly improving JavaScript performance
  • Improved theme integration for Mac OS X Lion
  • Added two finger swipe navigation for Mac OS X Lion
  • Added support for querying Do Not Track status via JavaScript
  • Added support for font-stretch
  • Improved support for text-overflow
  • Improved standards support for HTML5, MathML, and CSS
  • Fixed several stability issues
  • Fixed several security issues


See Firefox 9.0 Release Notes

The Firefox Stable PPA has updated for Ubuntu 10.04 Lucid and 10.10 Maverick, add the ppa and install Firefox 9.0 via:

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

For now, it has not yet come in Precise’s repository. Just download from Firefox 9 from: