If you are using Mozilla Firefox 3.6.4 Beta Mozilla released Mozilla released update, Firefox 3.6.4 Beta (build 4) for that which will be installed automatically if you enabled automatic update in settings of Firefox.
What’s new in Firefox 3.6.4 Beta (Build 4)
- Firefox 3.6.4 provides uninterrupted browsing for Windows and Linux users when there is a crash of Plugins like Adobe Flash, Silverlight and other plugins.
- If any plugin crashes user can reload the page to restarting plugin and try again.
- Firefox 3.6.4 fixed several security and stability issues found over previous versions of Firefox.
Read more details at Firefox 3.6.4 Beta (Build 4) release notes