After releasing Firefox 12 stable version, Mozilla devs have started pushing new versions to the other channels; i.e.; Beta, Aurora and Nightly. The nightly channel, which receives updates almost every day to implement latest experimental features, has been updated to the version # 15.
Firefox 15 final is scheduled to release in August 2012 with lots of improvements and new features. We will keep posting about the new features being added to the Firefox 15, so stay tuned to the BrowserFame.

Instant Search Coming To Firefox 15
Good news is that the Firefox 15 has already got a very exciting feature which will accelerate search using the search box of Firefox. Mozilla’s Patrick McManus describes this upcoming feature, “The feature basically lets non-network code hint to the networking layer that it will probably send a HTTP transaction to a particular site soon, but it isn’t ready to do so yet.” This starts high latency processes like setting up TCP and SSL handshake. Hence, the Firefox starts communicating with the sites even before the HTTP request is made.
Initially, this feature has been implemented to the search box of Firefox (accessible through the keyboard shortcut Ctrl + K). As the user starts typing in the search box, Firefox starts communication with the search provider. This feature is similar to the instant search of Google Chrome. Moreover, if the search provider supports SPDY, it will further boost up the browsing experience. Just to remind you here, Firefox now supports Google’s SPDY protocol which will be enabled by default in the upcoming Firefox 13.