https://bugzilla.mozilla.org/show_bug.cgi?id=1369872
1369872 - Combine skins/contrib/Mozilla/*.css and skins/custom/*.css into skins/standard/*.css
RESOLVED (umohm12) in bugzilla.mozilla.org Graveyard - Sandstone/Mozilla Skin. Last updated 2018-10-15.
combineskinscontribmozillacss