access denied

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 [https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean What do the security warning codes mean]

The only reason I sought help here is that those sites work w/o problems with the microsoft browser.

Thanks for the reply Fred. Doesn't look like AVG is the problem. I've only seen this on two sites: I suspect this one may be a Roboform problem. https://my.navyfederal.org/NFOAA_Auth/login.jsp?NFCUSIGNOFF=2 and This one only failed a couple of time today, and is now working normally. https://sa.www4.irs.gov/eauth/pub/login.jsp?Data=VGFyZ2V0TG9BPUY%253D&TYPE=33554433&REALMOID=06-00029c6a-0543-17b0-89b8-163b0acf40c7&GUID=&SMAUTHREASON=0&METHOD=GET&SMAGENTNAME=UOkC7yx4eMTO24FGxPfBRb5q3Mj3Xh3pyXfBEjYyHJ97nGCXu16wx5MzFHjfZmlG&TARGET=-SM-https%3a%2f%2fsa%2ewww4%2eirs%2egov%2fola%2f The only reason I sought help here is that those sites work w/o problems with the microsoft browser.

Your screenshot shows a reference to an http url. Have you selected HTTPS-only mode on the Privacy & Security page of Options? If you have a problem with an https site, this article may shed some light: https://support.mozilla.org/en-US/kb/error-codes-secure-websites