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Fixed in Firefox 19:
MFSA 2013-28 Use-after-free, out of bounds read, and buffer overflow issues found using Address Sanitizer
MFSA 2013-27 Phishing on HTTPS connection through malicious proxy
MFSA 2013-26 Use-after-free in nsImageLoadingContent
MFSA 2013-25 Privacy leak in JavaScript Workers
MFSA 2013-24 Web content bypass of COW and SOW security wrappers
MFSA 2013-23 Wrapped WebIDL objects can be wrapped again
MFSA 2013-22 Out-of-bounds read in image rendering
MFSA 2013-21 Miscellaneous memory safety hazards (rv:19.0 / rv:17.0.3)
Release Notes