Continuing the normal stream of maintainence builds, Mozilla issued a new Firefox which has several stability and security fixes.

The current changelog is meager, but the Bugzilla entry has much more:

• Fixed several security issues: 8 critical, 2 high, 4 moderate
• Fixed several stability issues

You can download the entire file from Mozilla's site, existing users will be automatically updated, or by selecting it from the Help menu.

Update: Mozilla issued a new release dubbed Firefox 3.6.8 that fixes a single stability issue affecting some pages containing plug-ins.