since last FF update there are several I can not get into because of secutity - Walmart, Amazon, and eBay. What is causing this?
I also see several other users that have similar problems and they all seemed to have started right after the last FF upgrade. Maybe you need to fix something real quick!
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What happens when you try? Error messages?
I get a message that the certificate for the website is not valid.
I also am having problems with very slow response to most websites much of the time and FF often shuts down and then sends an apology and asks if I want to restart.
The restart usually corrects the shutdown problem, but only for a while.
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