If you don’t have Firefox’s automatic update feature turned on, then you need to update your version immediately to Version 3.5.4.
Reports indicate that previous versions are subject to 11 critical security issues, including the risk of drive-by downloads. Drive-by downloads can include the installation of spyware, a virus, or other nasties, which can take place by simply visiting a web site, opening an e-mail, or by dealing with a popup.
According to Mozilla the following security issues have been dealt with in the release of Version 3.5.4.
MFSA 2009-64 Crashes with evidence of memory corruption (rv:188.8.131.52/ 184.108.40.206)
MFSA 2009-63 Upgrade media libraries to fix memory safety bugs
MFSA 2009-62 Download filename spoofing with RTL override
MFSA 2009-61 Cross-origin data theft through document.getSelection()
MFSA 2009-59 Heap buffer overflow in string to number conversion
MFSA 2009-57 Chrome privilege escalation in XPCVariant::VariantDataToJS()
MFSA 2009-56 Heap buffer overflow in GIF color map parser
MFSA 2009-55 Crash in proxy auto-configuration regexp parsing
MFSA 2009-54 Crash with recursive web-worker calls
MFSA 2009-53 Local downloaded file tampering
MFSA 2009-52 Form history vulnerable to stealing
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