Firefox 3.0.6 fixes several issues found in Firefox 3.0.5:

• 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.
• See the Firefox 3.0.5 release notes for changes in previous releases.

See the complete list of bugs fixed.