Just got an automatic update.
Release Notes
* Fixed several security issues.
* Fixed several stability issues.
* In previous versions of Firefox, some users experienced a problem where parts of the screen were not properly displaying after Firefox was open for long periods of time.
* Improved the ability for scripted commands (including those included in popular extensions like Adblock Plus) to work properly with plugins. (bug 438830)
* Removed the client user ID from crash reports.
* Fixed issues with the display of some Indic scripts.
http://www.mozilla.com/en-US/firefox/3.0.6/releasenotes/
Release Notes
* Fixed several security issues.
* Fixed several stability issues.
* In previous versions of Firefox, some users experienced a problem where parts of the screen were not properly displaying after Firefox was open for long periods of time.
* Improved the ability for scripted commands (including those included in popular extensions like Adblock Plus) to work properly with plugins. (bug 438830)
* Removed the client user ID from crash reports.
* Fixed issues with the display of some Indic scripts.
http://www.mozilla.com/en-US/firefox/3.0.6/releasenotes/