On 2013-05-30 14:29, Elias Persson wrote: > Seems like a Firefox bug. Should probably be reported to moz. > Content-Encoding says Firefox should decompress once, with the > result being something gzipped (according to Content-Type). > After some more digging, it's apparently an ancient bug. https://bugzilla.mozilla.org/show_bug.cgi?id=132702 TL;DR seems to be "don't content-encode anything which firefox won't be displaying itself".