Several things, the update to current version has a glitch in your system, the Extensions you are using the Security Software your running So since did not share any of the above while making your question ''please do so now''. As well please include the error message as we do not know what you saw nor what's in your computer. Please '''test in''' : SAFE MODE *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes In Firefox Safe mode these changes are effective: *all extensions are disabled (about:addons) *default theme is used (no persona) *userChrome.css and userContent.css are ignored (chrome folder) *default toolbar layout is used (file: localstore-safe.rdf) *Javascript JIT compilers are disabled (prefs: javascript.options.*jit) *hardware acceleration is disabled (Options > Performance > Uncheck to view) *plugins are not affected *preferences are not affected TEST'''''''''is issue still there ? Avast/AVG, Kaspersky, BitDefender, ESET & sometimes Mcafee intercept secure connections and send their own certificate or their scanners interfere. Note below is more or less a example now but is still useful. *https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message#w_avast-and-avg-security-products

tanks