Firefox 3.6.7 has been realased to fix some stability issues & some security issues in 3.6.6:
- MFSA 2010-47 Cross-origin data leakage from script filename in error messages
- MFSA 2010-46 Cross-domain data theft using CSS
- MFSA 2010-45 Multiple location bar spoofing vulnerabilities
- MFSA 2010-44 Characters mapped to U+FFFD in 8 bit encodings cause subsequent character to vanish
- MFSA 2010-43 Same-origin bypass using canvas context
- MFSA 2010-42 Cross-origin data disclosure via Web Workers and importScripts
- MFSA 2010-41 Remote code execution using malformed PNG image
- MFSA 2010-40 nsTreeSelection dangling pointer remote code execution vulnerability
- MFSA 2010-39 nsCSSValue::Array index integer overflow
- MFSA 2010-38 Arbitrary code execution using SJOW and fast native function
- MFSA 2010-37 Plugin parameter EnsureCachedAttrParamArrays remote code execution vulnerability
- MFSA 2010-36 Use-after-free error in NodeIterator
- MFSA 2010-35 DOM attribute cloning remote code execution vulnerability
- MFSA 2010-34 Miscellaneous memory safety hazards (rv:1.9.2.7/ 1.9.1.11)


[...] know it’s been only a few days since 3.6.7 was released but Mozilla have releases Firefox 3.6.8 to fix a stability issue affecting some pages [...]