NEW Firefox 56.0.2 WILL BE released by Mozilla. NOT available from the Firefox builtin updater at this time Firefox 56.0.2 breaks compatibility with older versions of the browser and Firefox ESR. Users who want to downgrade are advised to back up their profiles prior to installing the update. Release notes not yet available https://www.mozilla.org/en-US/firefox/56.0.2/releasenotes/
56.0.2 get from builtin updater
Firefox Release
October 26, 2017
Version 56.0.2, first offered to Release channel users on October 26, 2017
Fixed
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Disable Form Autofill completely on user request (Bug 1404531)
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Fix for video-related crashes on Windows 7 (Bug 1409141)
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Correct detection for 64-bit GSSAPI authentication (Bug 1409275)
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Fix for shutdown crash (Bug 1404105)
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Reference link to 56.0.1 release notes