||Firefox has multiple vulnerabilities. From the Red Hat alert:
Several flaws were found in the processing of malformed web content. A web
page containing malicious content could cause Firefox to crash or,
potentially, execute arbitrary code as the user running Firefox.
(CVE-2009-0040, CVE-2009-0771, CVE-2009-0772, CVE-2009-0773, CVE-2009-0774,
Several flaws were found in the way malformed content was processed. A
website containing specially-crafted content could, potentially, trick a
Firefox user into surrendering sensitive information. (CVE-2009-0776,