I was looking around, it seems 38.8.0 is the stable version for icecat...
38.8.0 publication date 10 May 2016 version type stable version streaming media URL https://ftp.gnu.org/gnu/gnuzilla/38.8.0/ 1 reference reference URL https://lists.gnu.org/archive/html/info-gnu/2016-06/msg00010.html title IceCat 38.8.0 release (English) language of work or name English publication date 24 June 2016 https://www.wikidata.org/wiki/Q2009630
