mozilla/lightbeam — pull request #557 by fmarier (2014-04-24 03:42:01+00:00)
Title: Losslessly optimize images

Used pngcrusher, optipng, advpng, jpegoptim and gifsicle to
optimize all images in a lossless fashion.

This is the script I ran: https://gitorious.org/fmarier-misc-scripts/user-scripts/source/optimize_images