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Firefox updated yesterday and now I get Protocol Errors. Is there a bug?

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Firefox updated itself yesterday and now it's sometimes reporting a Protocol Error when I try to open a website. Not always and it offers a Try Again button which usually works. So its not a serious problem for me but it is annoying and it suggests there is a fault in the new build.

Firefox updated itself yesterday and now it's sometimes reporting a Protocol Error when I try to open a website. Not always and it offers a Try Again button which usually works. So its not a serious problem for me but it is annoying and it suggests there is a fault in the new build.

Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

More Information

FredMcD
  • Top 10 Contributor
4307 solutions 60484 answers
Please explain the problem in detail. What happens? What is the exact error messages? There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own. https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message https://support.mozilla.org/en-US/kb/connection-untrusted-error-message [https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors?redirectlocale=en-US&redirectslug=Error+loading+web+sites Websites don't load - troubleshoot and fix error messages] http://kb.mozillazine.org/Error_loading_websites