Backed out changeset c1af8cec18e0 (bug 1455115) for turning mochitest test_bug1166138.html (bug 1240225) into almost permafailure on Android. CLOSED TREE

modules/libpref/init/StaticPrefList.h

@@ -149,7 +149,7 @@ VARCACHE_PREF(
 VARCACHE_PREF(
   "layout.css.parsing.parallel",
    layout_css_parsing_parallel,
-  bool, true
+  bool, false
 )
 
 // Is support for the font-display @font-face descriptor enabled?