I am using Firefox 6.02 and Windows 7 x86 version. I was recently unable to log in to Gmail, Hotmail and other such websites. I checked the preferences and figured out there was some security issue as it only happened when websites shifted to HTTPS or secure logins. When I saw the browser options after checking time and date settings as they also invalidate secure certificates. I noticed that although SSL 3.0 was checked, how ever TLS 1.0 was not selected. I selected it and applied the option and now every thing worked out fine, however this was recent that Gmail etc stopped working before that the options were same and it worked.
I have two questions: What is TLS 1.0? and Why were Gmail and Hotmail not working before?