The same sites open on Internet Explorer and Chrome browsers. 

            This problem with Firefox has started ever since I installed Windows 10. I never had any problem when I was using Windows 8.1.

            Kindly inform if this version of Firefox is incompatible with Windows 10 or if there is some other problem. 

I cannot access sites likes yahoo.com and mail.yahoo.com. "Secure Connection Failed" is the message I get. Also, Firefox hangs up very often, sometimes, even every few minutes - says "Firefox not responding". The same sites open on Internet Explorer and Chrome browsers. This problem with Firefox has started ever since I installed Windows 10. I never had any problem when I was using Windows 8.1. Kindly inform if this version of Firefox is incompatible with Windows 10 or if there is some other problem. Thanks.