Download Firefox 53.0.3 Release May 19, 2017

Version 53.0.3, first offered to Release channel users on May 19, 2017
Fixed
FIx hangs when using a proxy with NTLM authentication (bug 1360574)
Fix excessive resource usage from the captive portal detection service (bug 1359697)
Changed
Bump preloaded security information expiration times (bug 1364240)

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