Firefox 27 was released on February 4, 2014. It adds improved Social API and SPDY 3.1 support, as well as enabling of TLS 1.1 and 1.2 by default. Also, it brings many bug fixes, security improvements, and developer-related changes.[140]
Firefox 27.0.1 was released on February 13, 2014. It fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval, as well as JavaScript math correctness issues.[141]