I have recently a problem to access to sites https in all browsers. In the past I had a similar situation and that the problem was solved by removing Bytedefender.
Now, I have no antivirus, Windows security only, and there is an app called Lenovo VANTAGE in which the wifi security is disabled.
I use Windows 10 and the firewall works.
I googled many posts on the web and didn't reach how to repair my problem.
My access to Internet is by hotspot by my phone.
An example of message when I try to click a site is
Secure Connection Failed
An error occurred during a connection to www.dropbox.com. PR_CONNECT_RESET_ERROR
The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem.
Report errors like this to help Mozilla identify and block malicious sites
Can someone help me please?