Your system currently has an older version of Java and you are receiving this update notification because a newer version has been automatically detected.
This release addresses security concerns. Oracle strongly recommends that all Java SE 8 users upgrade to this release.
Please install this free Java Update by clicking on the Update button on the Java Update window.
Installing this update will ensure that your Java applications continue to run as safely and efficiently as always.
8u66 build 18 addresses an issue on Firefox.
_releaseObjectcalled from wrong thread
_releaseObjectcall to be made from a thread other than the main thread. This may cause a race condition, which may inadvertently crash the browser. This has been addressed in build 18 of 8u66. For more information, see Bugs@Mozilla 1221448. See JDK-8133523.
See FAQ for more information about 8u66.
For a list of bug fixes included in this release, see JDK 8u66 Bug Fixes page.
The JRE expires whenever a new release with security vulnerability fixes becomes available. Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Third Party Bulletin. This JRE (version 8u66) will expire with the release of the next critical patch update scheduled for January 19, 2016.
For systems unable to reach the Oracle Servers, a secondary mechanism expires this JRE (version 8u66) on February 19, 2016. After either condition is met (new release becoming available or expiration date reached), Java will provide additional warnings and reminders to users to update to the newer version.