Firefox 18.104.22.168 was released addressing the following security issues.
MFSA 2008-33 Crash and remote code execution in block reflow
MFSA 2008-32 Remote site run as local file via Windows URL shortcut
MFSA 2008-31 Peer-trusted certs can use alt names to spoof
MFSA 2008-30 File location URL in directory listings not escaped properly
MFSA 2008-29 Faulty .properties file results in uninitialized memory being used
MFSA 2008-28 Arbitrary socket connections with Java LiveConnect on Mac OS X
MFSA 2008-27 Arbitrary file upload via originalTarget and DOM Range
MFSA 2008-25 Arbitrary code execution in mozIJSSubScriptLoader.loadSubScript()
MFSA 2008-24 Chrome script loading from fastload file
MFSA 2008-23 Signed JAR tampering
MFSA 2008-21 Crashes with evidence of memory corruption (rv:22.214.171.124)
Ensure you to to your help menu and 'Check for Updates' to ensure you're protected.
Download Link: http://www.mozilla.com/en-US/firefox