mozilla/kuma — pull request #650 by apapirovski (2012-10-10 20:56:06+00:00)
Title: Lossless optimization of all the images Edit 

Not sure if this is actually of interest, but I optimized full _img_ folder with OptiPNG, PNGCrush, AdvPNG, PNGOut, JPEGOptim, and jpegtran.

The savings on the whole are between 10-20% or so, some individual files (and sometimes even whole folders) were reduced by up to 60-80% in size.