As some of you may have heard TLS1.0 got some bad news/press recently.
Various details: One, Two, and Three or check this Technical Paper (pdf).
So please go over here -> Firefox : Bug 480514 - Implement TLS 1.2 (RFC 5246) and VOTE!
If you're really ambitious you could also go vote for TLS 1.1 implementation (for the sake of maximizing compatability with web servers):
Firefox : Bug 565047 - Implement TLS 1.1 (RFC 4346)