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Bad Request

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I am getting a Bad Request notice when I try to make a payment on my PayPal account. It says browser sent a query the server does not understand. How do I fix this?

I am getting a Bad Request notice when I try to make a payment on my PayPal account. It says browser sent a query the server does not understand. How do I fix this?

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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

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean