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Says "Insecure connection" for nearly everything I want to load

Posted

I am trying to load YouTube, Wikipedia, and some other websites but I ended up with "Insecure connection". None of these are bookmarked pages, so https://support.mozilla.org/en-US/questions/1181480 does not help, as it is about search engines. Note that the websites I tried to visit are all HTTPS websites, but HTTP websites work.

I am trying to load YouTube, Wikipedia, and some other websites but I ended up with "Insecure connection". None of these are bookmarked pages, so https://support.mozilla.org/en-US/questions/1181480 does not help, as it is about search engines. Note that the websites I tried to visit are all HTTPS websites, but HTTP websites work.

Additional System Details

Installed Plug-ins

  • Shockwave Flash 27.0 r0

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0

More Information

FredMcD
  • Top 10 Contributor
4225 solutions 58977 answers

Chosen Solution

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate. 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 http://kb.mozillazine.org/Error_loading_websites