From Bugzilla Helper: User-Agent: Mozilla/5.0 Galeon/1.2.5 (X11; Linux i686; U;) Gecko/0 Description of problem: The PNGs don't contain tRNS chunk, so pixels with color index 0 (corresponding to transparent in the GIFs) are opaque (light-blue). Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: There's nothing to reproduce, look at the PNG chunks. Or, one can view e.g. /var/www/icons/blank.png (should be completely transparent) with any PNG capable tool (gqview, mozilla) to see it's light-blue instead. Additional info:
This is deliberate AFAIK since MSIE does not support PNG transparency.
I don't understand how a blue background which breaks the icons in all browsers can help MSIE users (except as a inferiority complex cure, because now they don't work for anyone instead of just them).