This update upgrades Firefox to version 52.5.1 ESR.
Security Fix(es):
* A privacy flaw was discovered in Firefox. In Private Browsing mode, a
web worker could write persistent data to IndexedDB, which was not cleared
when exiting and would persist across multiple sessions. A malicious
website could exploit the flaw to bypass private-browsing protections and
uniquely fingerprint visitors. (CVE-2017-7843)
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