My Favorite Firefox 12 Feature? View Source

From the ‘Little Things that Matter’ files:

The new Firefox 12 release is generating headlines for being the first have silent updates. As a Linux user though, that doesn’t interest me much, since Yum-Update and Apt-get are my installation/update methods of choice.

What does interest me personally about Firefox 12 is View Source. More specifically, the new numbered view source feature.